Alocasia lauterbachiana aka Purple Sword Alocasia

Alocasia lauterbachiana belongs to the arum family, Araceae. Its native range spans northern New Guinea and the Bismarck Archipelago. It grows in a wet tropical climate. Kew lists its form as a subshrub or shrub. The RHS describes it as an evergreen, rhizomatous perennial. In cultivation, it serves as an indoor foliage plant. It also suits a warm conservatory or greenhouse.

This plant has an upright shape and keeps its leaves year-round. Its long, dark green leaves have a spear-like shape. Wavy edges give each leaf a clear outline. Green and purple flecks mark the stems. These markings add interest alongside the leaves. Garden plants reach about 3.3–4.9 feet (1–1.5 metres) tall. Their spread reaches about 1.6–3.3 feet (0.5–1 metre). The RHS gives two to five years as the time to maturity. Its upright form suits displays where height matters more than width.

Give this plant bright light without direct sun indoors. The RHS also lists partial shade as a suitable position. Use peat-free houseplant compost with added perlite. The growing medium should hold moisture but let excess water drain. Loam and an acid to neutral pH suit it. Keep the plant sheltered and provide high humidity. A tray of damp gravel or pebbles beneath the pot can help. Keep temperatures above 15°C. Its RHS hardiness rating, H1A, calls for year-round protection under glass.

Water generously from spring through autumn while the plant grows. During this period, feed with a general liquid fertiliser. The RHS recommends feeding every two to three weeks. Cut watering back to a minimum during winter. The plant needs no routine pruning. Divide it in spring or summer to make new plants. Stem cuttings are another option in spring. Sow seed as soon as it ripens, at 23°C. These methods offer several ways to raise more plants.

Watch for glasshouse red spider mites and mealybugs. The RHS reports few disease problems for this species. All handling needs care because the plant can irritate skin and eyes. Wear gloves and other protective gear when working with it. It is poisonous if eaten and also toxic to pets. Keep it away from children and animals that might chew it.