Allium stellatum (prairie onion) — Clump forming

Overview

Allium stellatum is a clump forming bulbs in the genus Allium, part of the Amaryllidaceae family, with deciduous foliage. Allium stellatum grows best in full sun, and tolerates most soils and any pH. Its UK hardiness is rated H6. Suggested uses include city and courtyard gardens, cottage and informal garden, gravel garden, patio and container plants, wildlife gardens, cut flowers and flower borders and beds.

About

Allium stellatum, commonly known as the autumn onion, prairie onion, cliff onion, or glade onion, is a North American species of wild onion in the Amaryllidaceae family that is native to central Canada and the central United States. Grow it in full sun and most soil types. In UK gardens it is very hardy across most of the UK (RHS H6). It works well for city and courtyard gardens, cottage and informal garden, gravel garden, patio and container plants, wildlife gardens, cut flowers and flower borders and beds. It tolerates soil of any pH, well-drained conditions and south-facing, west-facing and east-facing aspects. Plant bulbs in autumn in fertile, well-drained soil in full sun. Most are fully hardy and undemanding. Allow foliage to die back naturally.

Wikipedia contributors, CC BY-SA 4.0 — Allium stellatum

Growing conditions

Best soil and position for Allium

Sunlight: Full sun
Soil type: Chalk, Clay, Loam, Sand
Soil pH: Acid, Alkaline, Neutral
Soil moisture: Well-drained
Aspect: South-facing, West-facing, East-facing
Exposure: Exposed, Sheltered
UK hardiness: H6

Plant details

Allium stellatum size, habit and characteristics

Plant type: Bulbs
Habit: Clump forming
Foliage: Deciduous
Suggested uses: City and courtyard gardens, Cottage and informal garden, Gravel garden, Patio and container plants, Wildlife gardens, Cut flowers, Flower borders and beds

Care notes

Pruning and caring for Allium stellatum

Propagation: Offsets, Seed
Pest resistance: Allium leaf miner, Onion fly
Disease resistance: Onion white rot, Onion downy mildew

Frequently asked questions

Where is the best place to plant Allium stellatum?

Allium stellatum prefers full sun. It suits exposed and sheltered positions.

What soil does Allium stellatum need?

Allium stellatum is adaptable and grows happily in most soil types, including chalk, clay, loam and sand. It is happy in soil of any pH. Aim for soil that stays well-drained.