Prayer Plant Care: Maranta, Calathea, Ctenanthe & Stromanthe

1. How prayer plant leaves move

Watch the same leaf at different times

Choose one fully expanded Maranta leaf and check its position in the morning and evening. In daylight it may lie nearly flat, displaying its pattern. Later it may lift enough to show the coloured underside, changing the outline of the plant without a new leaf having grown. Other genera in the family move their leaves too, although the timing and degree vary.

Photographs taken from the same spot, with the same mature leaf in view, can reveal the change more clearly than memory alone. Compare the angle in the morning and evening, then repeat on another day to learn its usual rhythm. A leaf that rises at dusk may be perfectly healthy. One that stays tightly rolled or limp needs closer attention to the leaf itself, the pot and the time of day.

The small moving joint below the blade

Near the base of the blade or stalk, many members of this family have a small moving region called a pulvinus (plural pulvini). Cells on its two sides alter their internal water pressure—turgor—and the leaf changes angle. A tiny shift at this living hinge can lift a broad blade, so the plant may appear to rearrange itself while the leaf remains the same size.

This regular change in leaf position is called nyctinasty. Both light and the plant's internal rhythms influence it, so the timing differs among species and even among leaves. Calathea lutea has been observed lifting and folding its leaves between morning and noon as sunlight exposure changed; a Maranta in your home may lift later. Watch your own plant over several days to learn its usual timing.

Does the movement have a purpose?

By lifting and lowering, a leaf changes its exposure to light and moving air. The benefits may differ among species and growing conditions, and no single purpose has been established for the whole family.

Knowing your plant’s normal movement gives you a useful starting point. A leaf that rises at dusk and opens again may simply be following its usual pattern. A fully grown leaf that remains curled, loses firmness or deteriorates while new growth weakens deserves a closer look at light, temperature and moisture around the roots. First, it helps to know which kind of prayer plant you have and how it usually grows.

2. Which prayer plant do you have?

Plant labels, old names and growth habits

Start with the name on your plant's label, if there is one. A label that only says “prayer plant” is especially common on Maranta, but it does not identify every member of the family. The markings on a mature leaf are helpful clues; the position of the stems and the place where new shoots appear often tell you just as much.

You may also find two botanical names for the same plant. Many ornamentals once classified as Calathea now belong to Goeppertia, although Calathea remains a valid genus. The rattlesnake plant, for example, was sold as Calathea lancifolia and is now accepted as Goeppertia insignis. Knowing both names makes older care advice and nursery labels easier to interpret.

Look beyond the leaf pattern to see how the plant is built. A Maranta may carry leaves along soft stems that creep sideways, while many Goeppertia produce individual leaf stalks close together at the base. Those differences become particularly obvious as new shoots appear, and they help explain why some prayer plants trail from a shelf while others gradually form a broad clump.

Maranta — bright veins and stems that spread

Maranta leuconeura shows how varied leaf markings can be within one species. The form often sold as ‘Fascinator’ has vivid red veins crossing green oval leaves. Plants sold as Maranta leuconeura var. kerchoveana have pairs of dark marks near the midrib, nicknamed ‘rabbit tracks’, while other cultivated forms carry a pale central stripe. Compare several fully grown leaves, since their markings may differ slightly.

The stems offer a second clue. Many forms of M. leuconeura spread across the mix before growing over the rim. They can trail from a shelf or cover the surface of a wider pot, and a healthy section of stem with a living node may eventually be used for propagation.

Goeppertia — rounded, rippled and patterned leaves

In Goeppertia, the leaves vary widely in shape and pattern even when the plants share a clumping habit. Goeppertia orbifolia has broad, nearly round blades crossed by pale curved bands. The peacock plant, G. makoyana, has longer oval leaves with pairs of dark, feather-like markings; its undersides are patterned as well.

Other members of the genus are easier to recognise by their leaf edges and textures. The rattlesnake plant, G. insignis, carries long, narrow, rippled leaves with dark marks along the midrib. G. rufibarba also has wavy leaves, but they are more slender, with purple-toned undersides and fine reddish hairs on parts of the stalks and midribs.

As these plants grow, many Goeppertia produce fresh leaf stalks from the base, slowly filling out the clump. That matters when you choose their position: the broad leaves of G. orbifolia, for example, may eventually reach far beyond the edges of its nursery pot.

Flowers are another identifying feature in some species. Goeppertia crocata, formerly Calathea crocata, may produce upright, vivid orange bracts around its smaller orange-red flowers indoors.

Ctenanthe — fishbone markings and upright or spreading growth

Ctenanthe species vary in height as well as leaf pattern. The fishbone plant, Ctenanthe burle-marxii, stays relatively low and spreads into a clump, with dark, feather-like markings beside the midrib of each oval leaf. It can reach around 60 cm tall in suitable conditions.

At the taller end is Ctenanthe lubbersiana. Its stems grow upwards and carry green leaves irregularly splashed with yellow. In suitable conditions it may reach around 2 m, though plants grown indoors often stay smaller.

The upright habit also appears in Ctenanthe oppenheimiana, with its long green leaves, silver V-shaped markings and wine-red undersides. C. setosa has similarly long leaves, and some cultivated forms show silvery foliage. Both can grow into bushy, upright clumps.

Stromanthe — layered leaves with colourful undersides

In Stromanthe, overlapping upright leaves often form distinct layers. When a leaf of Stromanthe thalia lifts or turns, its reddish-purple underside becomes visible. You may also encounter this species under its older name, Stromanthe sanguinea. The purple tones seen on the undersides of many prayer plants come from pigments called anthocyanins.

The selection sold as ‘Triostar’ makes this movement especially noticeable: its upper leaves carry irregular cream and green patches with pinkish tones, and the reddish undersides appear as they turn. Each leaf can be patterned differently. The exact origins of some plants sold under the ‘Triostar’ trade name remain uncertain, so the label alone cannot establish their species.

How new shoots fill the pot

New shoots reveal another difference among these plants. As the clumping kinds mature, fresh shoots often rise among the older stalks, sometimes from rhizomes—stems growing just below or near the surface of the mix. Each leaf is carried on a stalk called a petiole. More shoots mean a fuller plant, often with leaves extending far beyond the rim. Watching where they emerge helps you recognise healthy growth and, later, decide whether division is possible.

3. Where to keep a prayer plant indoors

Just brought one home?

The first few days with a new prayer plant are a chance to learn its condition. Look over the foliage before choosing its permanent spot: gently lift some open leaves to see their undersides, stalk joints and new shoots. A crease left by packaging may stay on a leaf without causing further trouble. Hidden insects, several leaves collapsing in quick succession or a soft stem base deserve closer attention.

Next, lift the nursery pot from its decorative cover. Check the drainage holes and any water underneath, then feel below the surface of the mix and notice the pot's weight. If the mix is moist and draining well, there may be nothing to change. If the centre is completely dry, follow the rewetting steps so the whole root ball takes up water, then let the pot drain fully. Empty standing water from the coverpot; mix that stays soaked or smells sour needs a closer look.

Firm stems and a potting mix that drains well suggest the plant can settle into a bright, sheltered place. A healthy arrival usually benefits from time to adjust before repotting, feeding or preventive spraying. A softening crown or rotting roots remain urgent, however, even during those first days.

Leave some space between the new plant's leaves and its neighbours if possible. An insect can be missed during the first inspection, so look again at the undersides and developing shoots over the following days. Fresh feeding marks or signs of insects call for a closer inspection using the pest guidance below.

Check the light reaching the leaves

Light is easier to judge by watching the leaves than by relying on the direction of the window. For many cultivated prayer plants, bright, filtered daylight is a good starting point. A curtain, overhang or neighbouring building may soften strong sun, while a deep corner of the room may provide too little light for steady growth. Direct sunlight through hot glass can leave pale, papery patches on the leaves.

For example, an open north-facing window may provide abundant diffuse light, while an east-facing one blocked by another building may be shaded for much of the day. A long leaf can even reach into direct sun when the pot itself is shaded. If new growth weakens in a dim position, move the plant gradually towards brighter, filtered light. New pale or papery marks on sun-facing leaves suggest the exposure is too strong; also check whether a leaf touches hot or cold glass.

Daylight changes through the year, and a previously bright spot may become too dim. A suitable grow light can help when daylight is limited; follow the manufacturer's guidance on light output and distance.

Keep warmth steady around the leaves and roots

The window also affects temperature. The air in a room may feel comfortable while the pot stands on a cold sill or leaves rest against chilled glass. A radiator can create the opposite problem by sending hot, dry air across the foliage for hours. Judge the conditions close to the pot and leaves, especially beside windows and heaters.

Keep leaves away from cold glass and draughts. For the calatheas covered by its care guide, the RHS suggests 16–21 °C. Other prayer plants may have different temperature needs, so use guidance for your particular species.

Humidity with fresh air and a healthy room

Temperature is only part of the picture: leaves also lose water to the surrounding air through transpiration. Long periods of hot, dry airflow can contribute to brown tips and edges. Damaged roots can cause similar marks, so leaf browning is a reason to consider both the air around the foliage and the moisture in the pot.

A small hygrometer near the leaves can tell you when a room is very dry. A bright, well-ventilated bathroom or a properly maintained humidifier may help. Grouping plants can raise humidity a little around their leaves, depending on airflow. A pebble tray mainly affects the air just above the water, so keep the pot above the waterline. Misting briefly wets the leaves without keeping room humidity higher; let them dry afterwards.

Which plant fits your room?

Allow for the plant’s mature shape when choosing its place. A spreading Maranta can trail over a shelf; Goeppertia orbifolia needs room for its broad leaves; and the taller stems of Ctenanthe lubbersiana may suit a position beside furniture. Stromanthe leaves can rise and overlap as their clump develops. Think about the likely height and spread of your species as well as its present size.

For someone choosing a first prayer plant, Maranta leuconeura is a sensible option if the room has filtered light and you can keep the mix moist without leaving the roots waterlogged. Look for healthy new growth and a pot that drains. Our prayer-plant collection shows the different forms and sizes. If you already own a prayer plant, give it a suitable place to settle and learn how its pot dries there.

Prayer plants and pet safety

If a pet chews houseplants, identify the plant before relying on a ‘pet-safe’ list. The ASPCA lists Calathea species as non-toxic to cats and dogs. That listing covers the plants it names; it does not establish whether every Maranta, Goeppertia, Ctenanthe or Stromanthe sold as a prayer plant is safe for pets.

This is one reason names matter for pet safety as well as plant care. The ASPCA has a separate ‘Prayer Plant’ entry that uses ‘Maranta’ as a common name but lists Calathea insignis as the scientific name. That historical name has been used for different plants. Match the accepted name of your own plant to a reliable veterinary entry before relying on a general listing.

Keep plants, fertilisers and pest treatments out of reach of animals that chew leaves, and follow the safety instructions on any products you use. Check an identified plant against a reliable veterinary reference. Even plants described as non-toxic can cause stomach upset if eaten, and pieces of leaves can cause choking. If a pet eats an unidentified or potentially harmful plant, or becomes unwell after chewing it, contact a veterinarian or animal poison service promptly. Have the plant's name, a photograph or sample, the approximate time and the amount eaten ready if possible.

4. Watering, potting mix and healthy roots

Wild habitats and moisture in the pot

Once you have found a suitable place for your prayer plant, learn how quickly its pot dries. These plants come from places with different rainfall patterns: Maranta leuconeura grows in central and eastern Brazil; Stromanthe thalia occurs in wetter tropical areas; and Ctenanthe oppenheimiana also grows where there is a dry season. This variety is one reason a fixed watering schedule cannot suit every plant. Indoors, light, warmth, airflow, potting mix and drainage determine how long water remains around the roots. Observe your own pot between waterings, especially after moving the plant.

Check what is happening inside the pot

You can learn that pattern by lifting the pot after a thorough watering to feel its weight. Lift it again over the following days and gently feel the mix below the surface. With practice, the change becomes easier to recognise. The top may look dry while the centre is still wet, particularly in a deep plastic nursery pot.

A lighter pot with mix drying around the roots may be ready for water. A heavy pot with a wet centre needs more time, and mix that remains soggy calls for a look at drainage. This is why a drooping leaf alone cannot tell you whether the plant needs a drink. Over time, steady new growth helps confirm that your routine suits it.

The balance matters because prayer plant roots need both moisture and oxygen. If the entire root ball repeatedly dries out, delicate roots can suffer; when the mix remains saturated, there may be too little air around them. Many prayer plants therefore grow well in mix that retains some moisture while allowing excess water to drain. Adjust your routine to the plant and the way that particular pot dries.

Water thoroughly and let it drain

When watering is due, pour slowly and spread the water across the surface until the root ball has taken it up and excess begins to run from the drainage holes. If the mix has shrunk away from the pot wall, the first water may rush straight down the gap while the centre stays dry. Pause, try smaller pours and feel the middle again. A brief bottom soak can help stubbornly dry mix take up moisture; then lift the pot out and let it drain fully.

Only return the inner pot to its saucer or decorative cover after the runoff has drained, and empty any water that collects afterwards. It is surprisingly easy for a tall coverpot to hide a pool at the bottom. The leaves can still look perfectly healthy while the lowest roots are standing in water.

Expect the drying pattern to change if the plant is moved or repotted. Cooler rooms, lower light and fresh mix can make moisture last longer, while faster growth may use it more quickly. Pot size and the amount of living roots also matter. Over the next few waterings, use both weight and moisture below the surface to get a feel for the new conditions. The houseplant watering guide explains other ways to judge when water is needed.

Roots need space for air as well as moisture

When water drains from the pot, some of the spaces between particles of mix fill with air again, supplying oxygen to the roots. That explains why the structure of the mix matters as much as the watering itself. Old mix may break down and compact, staying wet for too long; very chunky mix may dry before the roots have absorbed enough. Either problem can eventually affect the leaves.

A suitable mix should wet evenly, hold some moisture near the roots and still let the extra water drain. Peat-free mixes may combine coir, composted bark and mineral ingredients in different proportions. What matters is that the finished mix supplies moisture and air to the roots as it wets and dries.

Mix that has become dense and persistently wet, or that has shrunk away from the pot and is difficult to rewet, may need replacing. The repotting section explains when and how to do this. If soaked mix is accompanied by drooping, softening tissue or continuing decline, follow the root-health assessment promptly.

Choose a pot for the roots you have

Pot choice affects that moisture balance too. Choose a container with working drainage holes and room for the living roots. A pot much larger than the root system holds a greater volume of wet mix, which may take longer to dry. When repotting is necessary, leave only modest extra space around healthy roots; the repotting section covers the steps.

The pot material affects drying too. Moisture can escape through the walls of unglazed clay. Plastic and glazed containers hold that moisture within the mix for longer. Some spreading Maranta grow comfortably in broad, fairly shallow pots; individual root systems still vary. Choose a pot shape that suits the root ball you have, then watch how quickly the mix dries.

Does the water source matter?

When fresh leaf tips keep turning brown despite otherwise healthy growth, consider water quality after checking your watering routine, root condition and fertiliser use. White mineral deposits on the pot rim can suggest a build-up, although they do not prove what caused the leaf damage.

In a trial involving two cultivated forms of Maranta leuconeura, plants given distilled water developed less tip scorch. That finding does not mean that minerals in the water cause every brown tip.

Water filters differ in what they remove. An ordinary activated-carbon filter jug may improve taste or remove particular substances, depending on the cartridge, but it generally leaves dissolved calcium and magnesium in the water. Those minerals cause hardness, and leaving tap water standing does not remove them.

Reverse osmosis and distilled water remove far more dissolved minerals; clean, safely collected rainwater can also provide a lower-mineral supply. A household sodium-based softener works differently: it exchanges calcium and magnesium for sodium, which can accumulate in potting mix. Water from that kind of softener is a poor routine choice for prayer plants.

Once watering, roots and feeding appear suitable, try a lower-mineral source while keeping the rest of your routine consistent. Compare newly opened leaves to see whether fresh tip scorch decreases; older brown tips will not turn green again. If new leaves are already healthy with your usual water, there is no reason to change it.

5. New growth, feeding and everyday maintenance

Watch how a new leaf develops

A new leaf reveals how a prayer plant grows. At first, the blade may be a narrow, tightly wrapped roll with little of its pattern visible. As it opens, the veins or markings appear. On a spreading Maranta, the roll may emerge beyond the pot rim; on a Goeppertia, it may rise between older stalks.

Give that rolled leaf room to open. If it catches against a shelf or becomes tangled among older stalks, it may tear or crease; pulling at it can do more damage. One damaged leaf may be an accident. If new leaves repeatedly emerge distorted, especially with scars or insects around the growing point, check the growing conditions and look closely for pests; the symptom guide gives the relevant first checks.

Alongside its new leaves, Maranta leuconeura may occasionally produce small flowers indoors. Older leaves may also slowly decline as the clump develops. A single lower leaf yellowing and dropping can be part of normal growth when the rest stays firm and continues producing leaves. Several leaves yellowing together or weak new growth call for the checks in the symptom guide.

Feed when the plant is growing

New growth needs nutrients, but the plant may already be receiving them from its potting mix. Some mixes contain added fertiliser or slow-release feed; the label should tell you what is included and roughly how long it lasts. When that supply is likely exhausted and the plant is growing steadily, a balanced houseplant fertiliser may be useful. Follow the labelled dose and note when you feed.

Growth also responds to light and warmth, so slower growth is a reason to review those conditions before increasing fertiliser. Pale leaves alone cannot establish a nutrient deficiency. A waterlogged pot or softening crown needs attention before feeding is considered.

Cleaning leaves and trimming old damage

Dust is easier to notice on patterned leaves, and removing it gives you a chance to check their condition. Support a broad leaf in one hand and wipe gently with a soft, slightly damp cloth, taking care around velvet-like surfaces and newly opening blades. As you turn each leaf, notice the veins, the underside and the sheltered points where tiny pests might hide.

If a leaf has died completely or is rotting, remove it with clean, sharp snips without disturbing nearby stems. Where spreading spots suggest possible infection, avoid dragging the affected leaf across healthy foliage and clean tools before using them elsewhere. A healthy green leaf with one old brown tip still serves the plant; you can leave it, or trim the damaged tip neatly without cutting through healthy green tissue.

6. Repotting and propagation

When a plant needs a new pot

Repotting depends on root space and the condition of the potting mix. A prayer plant may thrive in its nursery pot for a long time. Eventually, roots may fill the available space, old mix may become compacted and stay wet, or dry mix may shrink away from the wall so water runs past the root ball. Those changes warrant a closer look at roots and drainage. One root growing through a drainage hole can still be perfectly healthy.

A plant with firm roots, enough space and mix that absorbs and drains water well can remain where it is. Deteriorating roots or failed drainage, however, may make prompt repotting necessary, even soon after the plant arrives.

Repot with the crown and roots in mind

Prepare a clean pot with working drainage holes and only modest extra room beyond the healthy living roots. Support the shoots at their base, or crown, as you slide out the root ball. Roots naturally vary in colour, and healthy ones can be brown; their firmness and structure matter more than colour alone. Preserve healthy roots and loosen only what you need to reposition the plant.

Set the plant at about its previous depth, work fresh mix gently around the roots and avoid pressing it into a dense block. Check the moisture already present in that mix before watering, then let excess drain. The new pot may hold moisture differently from the last one, so check how the mix dries over the next few waterings.

Dividing a healthy clump

An established clump can sometimes be separated into smaller plants through division. This works for many Goeppertia and Stromanthe, and for Maranta or Ctenanthe with suitable rooted shoots. Every division needs a living shoot or growing point and viable roots. Detached leaves without a growing point and roots will not form a new plant by this method.

Lift the clump and trace the connections among shoots, rhizomes and roots. Choose natural sections that each have at least one living growing point and enough healthy roots to support it. Ease them apart where possible; if you must cut a connection, use a clean, sharp tool and preserve firm living tissue. Place each section in a suitably sized draining pot.

A section with plenty of leaves can still have very few roots. If it has too few roots to support its leaves, leave it attached to the parent clump.

Maranta cuttings need a growing point

A spreading Maranta leuconeura offers another possibility: a stem cutting. Find a healthy node, the joint from which a leaf or new shoot can develop, and take some living stem with it. The cutting can root in a suitably moist propagation mix or clean water. If rooting in water, keep the node submerged and the leaves above the surface; change cloudy water and discard any cutting that develops rot.

A leaf with only its stalk attached may stay attractive for a while, but a viable stem node is required for this method to produce a new shoot. Once a water-rooted cutting has healthy roots and begins new growth, plant it in a small pot of draining mix. A cutting already rooted in suitable propagation mix can stay in its pot while it establishes; repot when the roots need more space or the mix needs replacing.

Taking cuttings from branching Ctenanthe

Some branching plants sold as Ctenanthe may also root from stem cuttings. Look for a healthy branch with a living node before cutting. The method depends on that branching habit; an isolated leaf stalk will not produce a new plant this way.

Cut below a suitable node with a clean tool and place the stem in free-draining propagation mix. A clear cover can reduce moisture loss, provided it stays out of direct sun and the air is refreshed; persistent condensation or mould calls for closer attention. Healthy new roots and continued growth are signs that the cutting is becoming established.

Helping new plants establish

Whichever method you use, a fresh division or cutting has fewer functioning roots than its parent plant. A repotted clump may also need time to settle. Keep the plant sheltered from drying draughts and give it gentle light. For divisions and cuttings in potting mix, maintain light moisture while allowing excess water to drain, and learn how the new container dries. Heavy feeding and frequent changes of position can wait until healthy growth resumes.

Watch the shoots as well as the leaves. Temporary drooping or the loss of an older leaf can accompany recovery. A base that steadily softens, rotting roots, a bad smell from the mix or sudden collapse need prompt inspection. Continuing deterioration should not be written off as ‘repotting shock’.

A firm crown, sound roots and a new leaf opening normally are encouraging signs that the plant is establishing. If recovery is slow but the plant remains stable, use the recovery checks before making another change.

7. When the leaves change: a practical symptom guide

Once you know how your prayer plant normally moves and grows, a change can stand out quickly: a crisp brown tip, a stalk hanging lower than usual or a faded patch in a familiar pattern. Look at the whole plant before changing its care. Is one old leaf affected, or are several leaves deteriorating? Are new leaves still opening well? Think about recent changes of position, contact with cold glass or an unusually wet pot, and notice how quickly the damage appears or spreads.

The pace of the change matters just as much. A stable old brown margin allows time to investigate. A base turning soft, a crown collapsing, rapidly spreading wet patches or a heavy active pest infestation call for prompt attention. Deal with those urgent problems first. Once the plant is stable, you can consider smaller adjustments to light or feeding.

Find your symptom and make the first check

The table gives you a starting point for each symptom. Use its first check to narrow down the possibilities, then read the relevant explanation below. For slow, stable changes, adjust one likely cause at a time so you can see whether it helps.

Brown edges and crispy tips

A brown leaf tip will not turn green again. The useful question is whether fresh browning is still appearing. Compare the older leaf with ones that have opened recently, and note where the marks occur. A dry edge, a pale patch facing the window and damage near a stalk can point towards different explanations, particularly when you know when they first appeared.

Start with the moisture around the roots. Has the root ball repeatedly dried out completely, or has the mix stayed soaked long after watering? Then consider intense sun through glass, hot air from a heater, dry room air, recent feeding and mineral residues on the pot. If these checks do not explain continuing tip damage, the water-quality section outlines when trying a lower-mineral supply may be useful.

Once a likely cause stands out, make one gentle adjustment and watch the next leaves unfold. The old brown margin will stay visible; clean edges on new growth and no expanding damage are encouraging signs that conditions have improved.

Curling and drooping: check the pot before reacting

Leaf movement matters here because an evening lift can look like curling. A fully grown leaf that stays tightly rolled, especially alongside weak stalks or poor new growth, deserves a closer look. Lift the pot and feel the mix beneath the surface before deciding it needs water.

If the root zone is truly dry and the pot feels unusually light, rewet the mix thoroughly and let it drain. Then watch whether the stems regain firmness. If the plant continues to droop even though the mix is damp, the cause needs another look. Watering again simply because the leaves hang lower may make matters worse.

For a limp plant in a wet pot, begin with the coverpot. Lift out the inner pot, empty any standing water and make sure the drainage holes are open. Feel the centre of the mix. Has it stayed soaked for days? Does it smell sour? Are the stem bases still firm? A stable plant with a firm crown may recover once drainage improves. If the base softens or the decline speeds up, inspect the roots promptly. Saturated potting mix can leave roots short of air; cold or physical injury can add to the problem. None of those signs alone proves a fungal or bacterial disease.

If there is a good reason to inspect the roots, slide the root ball out gently while supporting the shoots. Living roots can be brown and still be healthy; they retain their firmness and structure. Rotten roots may feel mushy, break apart or smell unpleasant. Do not cut roots just because they are brown or because you are unsure of their condition. Keep roots that are still firm and intact.

If some roots are unmistakably rotten, cut away only the decayed tissue back to firm, healthy material with a clean tool, and discard what you remove. Replace foul, broken-down mix and return the plant to a clean pot that drains. If the crown is collapsing, the root findings are unclear or the decline continues quickly, seek specialist diagnosis. Wet soil alone does not establish a pathogen, and healthy roots are worth preserving.

Yellow leaves, faded markings and scorched patches

A lower leaf may slowly yellow and drop as new leaves take its place. That can be normal when the rest of the clump is firm and growing. When several leaves yellow together, fade or lose firmness—especially alongside weak new growth—look at moisture in the pot, light and signs of pests.

Where and when a mark appeared can help you work out what happened. Growth in a dim corner may slow before the leaves begin to fade. Strong sun can leave dry, pale marks on the window-facing side, while contact with cold glass can also injure a leaf, especially in bright light. Recent sprays or cleaning products sometimes leave similar patches. Think back to the plant's position and what touched it before the first mark appeared.

When light, roots and pests on the leaf undersides offer no explanation, review your recent feeding routine before adding nutrients. Yellow or pale leaves alone are too broad a clue to justify increasing fertiliser.

Spots, damaged new leaves and unusual surface marks

A rolled leaf may brush against a shelf or catch on an older stalk and open with a tear. One imperfect new leaf can be a simple accident. If new growth is repeatedly distorted, especially with fine scars, dark specks or insects in the tender folds, gently check the growing point for pests and damage.

Raised, rough or corky spots sometimes begin as small, wet-looking marks. One possible cause is oedema, which can develop in a susceptible plant when the roots take up water faster than the leaves lose it. Other problems can look similar. To investigate, note how long the mix stays wet, how air moves around the foliage and whether new spots continue appearing. A single mark cannot establish a diagnosis.

Marks that remain small and unchanged are different from soft lesions that enlarge or appear on additional leaves. Photograph a developing spot in the same light so you can judge its progress. If soft or wet-looking damage spreads, use the disease precautions without assuming that a particular fungus or bacterium has been identified.

How to tell whether a change is helping

To judge whether an adjustment has helped, follow the signs connected to the problem you found. That may mean watching the next leaf open, checking for fresh tip damage, noticing whether stems stay firm or learning how quickly the pot dries. Photographs taken from the same angle are helpful with patterned leaves. A crown that continues to soften or wet lesions that spread need prompt attention, even while other parts of the plant appear stable.

Firm stems and healthy new leaves are reassuring signs. Old tears and brown edges usually remain visible, so look for continued healthy growth and damage that has stopped spreading. When insects or fresh feeding marks are part of the picture, the next step is to identify the pest before treating it.

8. Pests, diseases and safe responses

Look closely before treating pests

Pale speckles, scars and distorted new leaves can make pests worth investigating, but marks alone rarely identify which one is present. Look in good light, turning leaves gently to see their undersides and following the veins towards stalk joints, overlapping bases and folds around new shoots. A phone camera or magnifier may reveal movement or traces that are difficult to see unaided. Dust, water marks and natural hairs can be misleading, so look for a living pest or convincing feeding evidence.

Once a pest or convincing fresh feeding damage is found, keep the affected plant's leaves apart from neighbouring plants where possible and inspect nearby pots. Be gentle with the foliage: rubbing hard or spraying forcefully can leave scars that make it harder to judge whether a treatment is working.

Recognise the most common pests

Spider mites. Tiny pale dots may gradually give a leaf a stippled appearance. Search the underside and along the veins for minute mites, sometimes with delicate silk around stalk joints. Ordinary spiderwebs are not sufficient evidence. The spider-mite guide shows how to identify the signs and choose appropriate control.

Thrips. New leaves may open with silvery scrapes, irregular scars and small dark droppings. Check sheltered folds for narrow adults or younger stages. Scuffs from rubbing during transport can look similar, so look for insects before treating; the thrips guide has more identification details.

Mealybugs. White, wax-covered insects can hide between leaf stalks and overlapping leaves; cottony masses may contain eggs and wax. Some species also live around roots. If a declining plant has insects or waxy deposits in the potting mix, inspect around the roots. Mineral deposits and lint can also look white, so look for actual insects or their characteristic wax before treating. The mealybug guide shows what to look for.

Scale insects and other sap feeders. Scales may look like pale or brown bumps attached firmly to veins or stalks, while aphids can gather on tender shoots. Some sap feeders excrete sticky honeydew; a superficial black film of sooty mould can grow on it. If a leaf feels sticky, look for the insects producing that residue before assuming the black coating is a disease inside the leaf.

Fungus gnats. Small, dark flies lifting from damp mix are often adult fungus gnats. The adults usually cause little direct damage to established plants. Their larvae live in the mix and, when numerous, can injure delicate roots, seedlings and newly rooted cuttings.

If you see gnats, check how long the surface of the mix stays wet. When it remains damp for days, review watering and drainage without letting the roots dry out completely. Yellow sticky cards help you see how many adults are present, but they do not control the larvae and may catch other small insects. If seedlings or newly rooted cuttings are struggling, check the mix for larvae before considering a control that targets them. Adult flies alone rarely explain damaged mature leaves.

When disease may be involved

A new spot can be caused by injury or disease, and the way it changes over time offers clues. Enlarging wet-looking patches, softening shoot bases or fuzzy growth on dying tissue deserve attention; grey mould, for example, can colonise injured material in damp conditions. Cold injury, contact with sprays, physical tears and oedema can look similar. One spot cannot identify a particular fungus or bacterium, so pay attention to whether the damage spreads and whether the base stays firm.

Remove dead or decaying leaves and discard them. Avoid splashing water over suspicious wet patches, and clean tools after handling affected tissue. If spots are spreading or the stem base is becoming soft, move the plant away from others if possible and photograph the changes. Rapidly worsening soft decay may need specialist diagnosis. For drooping above saturated mix, also follow the root and drainage checks: roots short of oxygen can decline even when no infection has been confirmed.

Choose a treatment for the pest you found

For a small, confirmed infestation, you can remove individual insects or gently rinse the leaves if they tolerate it. Keep water out of tight crowns and let the leaves dry. Remove dead material that is badly infested, wipe nearby surfaces and check again for young pests hiding around the stalks. Strong homemade soaps, oils and alcohol mixtures can scorch delicate leaves; a spreading infestation may need targeted treatment.

Biological controls can help with identified pests. Choose a beneficial organism that targets the pest and the stage of its life cycle you are dealing with. Check that your room's temperature and humidity suit it, and follow the supplier's advice on application and compatibility. Pesticide residues can harm beneficial organisms. Afterwards, look for living pests and new feeding damage to see whether the control is working.

Before using a plant-protection product, confirm that it is currently authorised in your country for the exact intended use. The label must cover the ornamental plant or plant group, the identified pest and indoor use, and the product must be approved for use by home gardeners.

Follow the approved dose and application method, all safety precautions and any permitted repeat treatments on the label. A product offered for sale online may have different authorised uses. In Germany, consult the BVL official authorisation database; other countries have their own authorities.

Follow the label's rules for keeping children and pets away, ventilating the room and protecting aquaria or food-preparation spaces. Never raise the dose, combine products without authorisation or choose a repeated treatment interval of your own.

After treatment, return to the places where you first saw pests: undersides, sheltered stalk joints and new leaves. Watch for living insects and fresh feeding marks, since old scars may remain after a treatment succeeds. If pests or new damage persist, identify the life stage still present and check whether the chosen method reaches it before changing treatments.

9. Sources and further reading

These are the botanical, scientific and safety references behind the names and guidance in this article.

• Royal Botanic Gardens, Kew — Plants of the World Online. Current records for Marantaceae, Goeppertia insignis, the different Calathea insignis Petersen, Stromanthe thalia, Maranta leuconeura, Ctenanthe oppenheimiana and other named species.
• North Carolina State Extension. Maranta leuconeura: description and occasional indoor flowering.
• Borchsenius, Suárez & Prince (2012). Molecular phylogeny and redefined generic limits of Calathea (Marantaceae), Systematic Botany.
• Royal Horticultural Society. How to grow calatheas; Ctenanthe burle-marxii; Ctenanthe lubbersiana; Goeppertia rufibarba; Goeppertia crocata; Maranta leuconeura var. kerchoveana; unresolved Ctenanthe pilosa ‘Golden Mosaic’; houseplant cuttings; water sources and softened water; overpotting; and oedema. The RHS describes stem cuttings for a branching plant sold as Ctenanthe pilosa ‘Golden Mosaic’; its recorded botanical name has unresolved status.
• Hughes & Lev-Yadun (2023). Why do some plants have leaves with red or purple undersides?, Environmental and Experimental Botany.
• Minorsky (2019). The functions of foliar nyctinasty: a review and hypothesis, Biological Reviews.
• Herbert & Larsen (1985). Leaf movement in Calathea lutea (Marantaceae), a study of observed daytime leaf positions.
• Nguyen and colleagues (2018). Biochemical and physiological characteristics of photosynthesis in plants of two Calathea species, International Journal of Molecular Sciences. The study examined plants identified as Calathea insignis and C. makoyana and reported shade-adapted photosynthetic traits; it does not establish a single indoor light target for prayer plants.
• Hogewoning & Harbinson (2007). Insights on the development, kinetics, and variation of photoinhibition using chlorophyll fluorescence imaging of a chilled, variegated leaf, Journal of Experimental Botany. A controlled experiment on leaves identified as Calathea makoyana found that chilling combined with light damaged photosynthetic tissue; the study did not establish a minimum safe temperature for the whole family.
• Strojny and colleagues (1999). Effect of nutrient solution concentration and NH₄:NO₃ ratio on Maranta growth, Scientia Horticulturae. In a greenhouse trial, two cultivated forms of Maranta leuconeura had different optimal nutrient concentrations. The trial doses are not home-feeding instructions.
• Beeson & Chen (2018). Quantification of daily water requirements of container-grown Calathea and Stromanthe produced in a shaded greenhouse, Water.
• Royal Horticultural Society. Indoor sap-feeding insects; mealybugs and root-feeding species; fungus gnats; and leaf damage on houseplants; and how to help a poorly houseplant.
• ASPCA Animal Poison Control. Prayer plant and Calathea records; verify the scientific name listed in each entry.
• CDC. Choosing home water filters and home water treatment systems.
• German Environment Agency (Umweltbundesamt) and US Environmental Protection Agency. Home ventilation and mould prevention and use and care of home humidifiers.
• European Union and German Federal Office of Consumer Protection and Food Safety (BVL). Regulation (EC) No 1107/2009, Article 55 and authorised plant-protection products.