Alocasia reginula 'Ninja Tricolor'

Background of Alocasia reginula ‘Ninja Tricolor’

‘Ninja Tricolor’ belongs to Alocasia reginula, a species believed to come from Borneo. Its exact habitat in Borneo is unknown. Warmth, moderate humidity and bright indirect light suit it indoors. Use a fine, airy mix and keep it lightly moist.

Caring for Alocasia reginula ‘Ninja Tricolor’

• Light: Supply bright, filtered light to support the green portions of the variegated foliage. The tissue within the active growing point determines the tricolour pattern of each new leaf.
• Watering: Water thoroughly when the surface starts to dry. Keep the main root zone lightly and consistently moist.
• Humidity: Maintain 60–80% humidity. Stable humidity supports delicate new leaves during expansion.
• Temperature: Keep the plant consistently warm and protect it from cold draughts.
• Substrate: Use a small pot containing coir-based potting mix, small bark and perlite or pumice. This provides even moisture and ample oxygen around the roots.
• Feeding: Apply a dilute complete fertiliser during active growth. Adjust the amount to the plant’s current growth rate.
• Variegated growth: Retain healthy leaves containing useful green tissue. These green areas supply most of the plant’s energy.
• Repotting: Repot after roots fill most of the container. Increase the pot by one size and preserve the planting depth.
• Propagation: Use rooted offsets, cormels or rhizome divisions with a viable growth point. Once foliage develops, continue growing propagules that produce enough green tissue to support themselves.

Coloured growth and stress in Alocasia reginula ‘Ninja Tricolor’

• Cream or very pale areas turn brown first: Low-chlorophyll tissue is more vulnerable to direct sun and moisture stress. Keep the plant in stable, bright filtered light and avoid abrupt exposure changes. The white-variegation guide explains how to support pale growth.
• Pink, cream and green proportions change from one leaf to the next: Variegation naturally varies across successive leaves. Assess the pattern over several growth cycles and keep light, moisture and temperature steady. The plant’s own tissue carries the pattern.
• A mostly pale leaf grows slowly or begins to decline: It contributes less photosynthesis than a greener leaf. Protect the remaining green tissue, keep the roots healthy and allow the plant time to produce a better-balanced leaf.
• Yellowing is paired with a soft base or sour substrate: Check for root or corm rot promptly. Remove all soft brown areas, then repot the firm, healthy corm and roots in a coarse mix. Use the root rot guide for the full rescue sequence.

Alocasia reginula ‘Ninja Tricolor’ is toxic to people and pets

• Keep this plant away from children, cats and dogs.
• Its leaves and stems contain insoluble calcium oxalate crystals, which can irritate the mouth, throat, skin and eyes.
• Chewing may cause burning pain, drooling, swelling, vomiting or difficulty swallowing. Contact a veterinarian or medical professional after exposure, especially if swelling or breathing problems occur.

The status of the ‘Ninja’ name

Alocasia combines the Greek prefix a-, meaning “without” or “lacking”, with Colocasia, the name of a related aroid genus.

The formal botanical citation is Alocasia (Schott) G.Don. George Don established the genus at that rank in 1839 in Hortus Britannicus, edition 3, page 631.

Latin regina means “queen”; its diminutive reginula means “little queen”. Alistair Hay described Alocasia reginula in 1998 in Gardens’ Bulletin Singapore, volume 50, page 258.

The horticultural name ‘Black Ninja’, also sold as ‘Black Velvet Ninja’ or simply ‘Ninja’, appeared around 2020. It remains unresolved whether this is a distinct cultivar or only a minor mutation of ‘Black Velvet’.