Light
Bright indirect • approx. 10,000–20,000 lux










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Quick Care Guide
Light
Bright indirect • approx. 10,000–20,000 lux
Watering
Water when ~20–30% dry
Substrate
Bark-rich aroid mix with coir and pumice; airy yet moisture-retentive
Temperature
Ideal: 18–30 °C • Avoid below: 15 °C
Humidity
Humid 60–80 % +
Growth habit
Upright clumping herbaceous perennial.
Support
not needed
Growth speed
High
Max size indoors
Max. height: 250 cm • Max. spread: 200 cm
Toxicity & safety
Toxic
Origin & habitat
Native from Central Malesia to Queensland (Murray Group)
Outdoor growing
Outside from 15 °C · sheltered spot
These care values are quick reference points for indoor growing. Use them as a guide, then adjust for pot size, substrate, temperature and how quickly the substrate dries.
For more detail, read the full product description or visit our Plant Care Guides.
Alocasia macrorrhizos is the classic green giant taro: an upright tropical aroid with glossy sagittate leaves, thick petioles and a thick base that becomes heavier with age. It grows best with warm roots, bright filtered light and space around the leaves.
Even young plants show thick petioles, widening leaves and strong roots. Older specimens can form a trunk-like stem with the leaves gathered higher on the plant, giving it the wide, upright shape of giant taro.
The leaves are green, smooth and firm, with clear veins and a broad sagittate to ovate-sagittate shape. In favourable tropical growth, the species can produce petioles around 1.3 m long and blades over 1 m long. Indoors it usually stays smaller, but it still needs more clearance than compact Alocasias.
Alocasia macrorrhizos is native from Central Malesia to Queensland’s Murray Group and grows in warm, wet tropical conditions. It has also been widely cultivated in tropical regions, which explains its long history as a familiar giant taro.
Warm roots are especially important after watering and while new leaves are forming. Large roots can take up plenty of water during a growth phase, but a deep indoor pot may stay wet below the surface. Check pot weight, warmth and petiole firmness before watering.
Propagate by division, offsets, basal shoots or firm rhizome sections while the plant is producing new leaves. Each piece needs firm tissue, root activity and warmth to restart. Mature plants can produce spathes and spadices; indoors, its broad green leaves and upright size are the clearest traits.
The name macrorrhizos refers to large or long roots, matching the plant’s thick rhizome and root structure. Like other Alocasias, this species contains irritating calcium oxalate crystals. Keep it away from pets and young children, and wear gloves when cutting or dividing.
With steady warmth, light and root space, it develops broad leaves, a thick base and upright growth indoors.
Plant names, growth habits, natural habitats and indoor care guidance are checked against trusted botanical, habitat and horticultural references before publication.View our plant care resources and references.