Alocasia reginula ‘Ninja’

Origin of Alocasia reginula ‘Ninja’

Alocasia reginula ‘Ninja’ belongs to Alocasia reginula, a compact species thought to come from Borneo. Its natural habitat on Borneo is unknown.

Care for Alocasia reginula ‘Ninja’

Potting mix: Choose a light, rich mix that drains easily and remains airy.

Watering: Water when the upper part of the mix begins to dry, before the roots dry throughout. Water through the mix and let the container drain completely before removing any collected runoff.

Light: Filtered daylight suits ‘Ninja’; avoid prolonged harsh sun.

Temperature: Steady warmth near 18–29 °C is suitable; protect the plant from prolonged drops below 15 °C.

Humidity: Keep moisture in the air around 60–80% during everyday care. Use soft ventilation around the leaf canopy.

Feeding: Use a light dose of complete houseplant fertiliser while fresh growth is active, then ease off as growth slows.

Repotting: When the root ball becomes crowded, repot into a pot just large enough to provide fresh growing space.

Propagation: Use an established rooted offset and keep as much of its root system as possible when potting it separately.

Mite spots on dark leaves, a softening stem base and stuck new growth

• Fine pale speckles or webbing show against the dark leaves: Check both sides of the leaves, especially close to the veins and the bases of the leaf stems, for spider mites. Isolate an affected plant, clean the foliage thoroughly and use a treatment labelled for spider mites on indoor ornamental plants, repeating it only at the interval stated on the label. See our spider-mite guide for more help.
• The stem base becomes soft or an unpleasant smell comes from the pot: Check the roots and base of the plant for rot rather than waiting for more leaves to collapse. Cut away any soft or rotten parts with a clean, disinfected blade, disinfecting it again between cuts. Discard the removed rotten material. Repot the healthy part of the plant in fresh, freely draining mix. Follow our root rot guide if the base itself is affected.
• A new leaf remains partly rolled or comes out distorted: Examine the new growth for mites or thrips before changing the plant's care. If pests are present, isolate the plant and use a treatment labelled for the identified pest on indoor ornamental plants, following the label for repeat timing. If no pests are visible, leave the leaf alone and keep moisture, warmth and humidity steady while it finishes opening.
• Several leaves yellow while the whole plant begins to droop: Check whether the potting mix is still heavy and wet or has become unusually dry. Correct that moisture problem first and keep the plant warm; do not add water automatically just because the leaves are hanging.

Alocasia reginula ‘Ninja’: toxic if chewed

• Pets: This Alocasia is toxic to cats and dogs. Keep the plant and any cut pieces where pets cannot chew them.
• Children and handling: Keep it out of reach of children. Sap from damaged tissue can irritate skin and eyes, so wash your hands after pruning and avoid touching your face.
• Why it irritates: Alocasia tissue contains insoluble calcium oxalate crystals. Chewing or contact with sensitive tissue can cause immediate local irritation.
• Possible symptoms: Mouth exposure can cause burning pain, drooling, swelling, nausea or vomiting, and difficulty swallowing.
• After exposure: For a pet, contact a veterinarian. For a person, remove any plant material from the mouth and rinse with water; seek medical or poison-control advice if symptoms are significant. Breathing difficulty or rapidly increasing swelling needs urgent medical attention.

The names reginula and ‘Ninja’

The species epithet reginula means “little queen”, from the diminutive of Latin regina, “queen”. Alistair Hay published Alocasia reginula in 1998 in Gardens’ Bulletin Singapore, volume 50, page 258.

The horticultural name ‘Black Ninja’ appeared around 2020, and the names ‘Black Velvet Ninja’ and ‘Ninja’ are also used for this line.