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Allium stellatum (Prairie onion)

Other names: Autumn onion, Fall glade onion, Cliff onion

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Species
A. stellatum is an upright, bulbous perennial with flat, linear, aromatic, mid-green basal leaves and slender, erect stems bearing loose umbels of reddish-pink to pale pink flowers from midsummer into early autumn.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
0.5 m 0.3 m 2-5 years
1 ft 0 ft 2-5 years

Where to grow

Soil type
  • Chalky
  • Loamy
  • Sandy
Soil drainage
  • Well-drained
Soil pH
  • Acid
  • Alkaline
  • Neutral
Sunlight
  • Full Sun
Aspect
  • East
  • West
  • South
  • North
Exposure
  • Exposed
  • Sheltered

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Additional plant details

Cultivation

Grow in well-drained, preferably chalky, rocky soil in full sun. Plant bulbs 5-10cm deep in autumn. Tolerates average, moist conditions if competition from taller, more aggressive plants is eliminated. Self-seeds readily.

Suggested uses

Gravel, Rock, Architectural, Beds and borders, Cottage/Informal, Wildflower, Prairie planting

UK hardiness

H5

USDA zones

Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

Sunset zone

WUCOLS

North-Central Coastal = Unknown
Central Valley = Unknown
South Coastal = Unknown
South Inland = Unknown
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Deciduous

Habit

Erect flower stem

Native to

North America

Drought tolerant

No

Flood tolerant

No

Toxicity

Not toxic

Plant care

Pruning

No pruning required. If desired, remove leaves only after they have completely died down. Deadhead to prevent unwanted seedlings.

Propagation methods

Seed, Offsets

Propagation

Remove offsets in autumn. Sow seed in a cold frame in spring.

Pests

Pest free, may suffer from slugs on new growth.

Diseases

Onion rot

Downy mildew

Sow spores or seeds as soon as ripe on moist compost

Add grit to clay soils to improve the drainage

Separate bulb offsets

Plant Allium, Erythronium, Colchicum and Galtonia bulbs

Remove faded or dead foliage (optional)

Sow seeds in a cold frame in spring

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Companion plants (0)

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