Alocasia augustiana L.Linden & Rodigas

• Genus: Alocasia
• Botanical Background: First described by Louis Linden and Émile Rodigas in L’Illustration horticole 33:61 (1886).

• Geographical Range: Endemic to the rainforests of New Guinea, primarily in lowland to montane wet forests
• Environment: Thrives in high humidity (often >70 %), warm temperatures, and moist, well‑drained soils beneath a shaded canopy

Leaves

• Large sagittate to cordate leaves
• Typically 20–90 cm long
• Glossy green with prominent veins

Inflorescence (Spadix & Spathe)

• Produces an erect spadix bearing small unisexual flowers, enclosed by a greenish spathe
• Blooms are inconspicuous and often hidden by foliage

Growth Habit

• Terrestrial perennial forming upright clumps from a tuberous rhizome
• Not epiphytic or aquatic

Light Requirements

• Bright, indirect light
• Avoid direct sun which can scorch leaves

Watering & Humidity

• Keep the growing medium evenly moist but not waterlogged
• Maintain high humidity (60–80 %), using misting or a humidifier as needed

Soil & Potting Mix

• Use a chunky, well‑draining mix rich in organic matter (e.g., peat, bark, perlite) to retain moisture yet allow airflow

Temperature & Fertilizer

• Ideal range 15–29 °C (60–85 °F)
• A balanced houseplant fertilizer, and reduce feeding in winter

Division and Cuttings

• Propagate by dividing healthy rhizome offsets in spring; ensure each division has at least one growing point

Seeds

• Uncommon; fresh aroid seeds germinate in 2–3 weeks under warm (21–29 °C), moist conditions, but viability declines rapidly

Typical Issues

• spider mites, aphids, mealybugs and scale
• Root‑rot from overwatering

Treatment Recommendations

• For pests apply insecticidal soap or neem oil, and isolate infested plants
• For root rot reduce watering, improve drainage, and repot in fresh medium

• Contains raphide crystals of calcium oxalate, making all plant parts irritant if ingested

• Prized for its bold arrowhead foliage and collector rarity; a striking specimen in moist, shaded displays

Wild Population Status

• Not evaluated by the IUCN Red List; habitat loss in New Guinea may pose future risks

Market Availability

• Uncommon in mainstream trade; primarily obtainable through specialized aroid nurseries and botanical institutions