Allium carolinianum

Allium carolinianum is a bulbous perennial in the Amaryllidaceae family. Its native range spans Central Asia, Mongolia, and the Himalaya. It grows in cold subalpine or subarctic regions. Wild plants grow on slopes with stones or gravel. Records place them at elevations of 9,840–16,400 feet [3,000–5,000 metres]. It is not native to Britain or Ireland.

This small plant forms clumps and loses its leaves seasonally. Its flat, strap-shaped leaves are mid-green. Straight flower stems reach about 1.3 feet [0.4 metres]. The RHS gives an upper garden height of 1.6 feet [0.5 metres]. Spread reaches about 0.3 feet [0.1 metres]. Plants reach their full size within one to two years. The bulbs often grow in pairs. Each bulb can measure about 0.08 feet [0.025 metres] across.

Dense, round flower heads appear in late spring and early summer. Their colour ranges from pale red to purple-red or white. The compact size suits beds, borders, gravel gardens, and pots. The RHS also lists courtyard, cottage, coastal, and wildlife gardens as uses. These settings offer several ways to display its small flower heads. Remove spent flower stems and old leaves as needed. The plant needs no other pruning.

Give it full sun and fertile soil that drains well. The RHS lists chalk, loam, and sand as suitable soils. It accepts acid, neutral, or alkaline conditions. Moist soil suits it, provided water can drain away. Choose a sheltered site with a south- or west-facing aspect. Use containers where heavy clay stays wet through winter. The RHS rates it H6, covering winter lows of −20 to −15°C. To make more plants, lift bulbs after flowering and detach offsets. Watch for allium leaf miner and onion fly. Onion white rot and onion downy mildew may also occur.

PFAF lists the bulbs and leaves as edible raw or cooked. It also lists raw flowers as a salad garnish. However, the RHS page warns that this plant harms pets. PFAF notes no poisoning reports specific to this species. Its broader warning concerns other members of the genus. These sources therefore do not establish safety for pets. PFAF also reports using the juice to repel moths. It describes the whole plant as a repellent for insects and moles. The evidence gives no species-specific medicinal use.