Alphabetical Plant Listing

Allium stellatum (Prairie Onion)

Autumn Onion, Prairie Onion


Allium stellatum (Prairie Onion) is a bulbous perennial forming a very compact clump of flat, slender, grass-like green leaves, 12 in. long (30 cm). In midsummer to early fall, profuse, rounded umbels, 3-4 in. across (7-10 cm), tightly packed with rose-pink to lavender flowers are borne atop leafless stems just above the foliage. Emerging in spring, the foliage usually dies back by the time of flowering. All parts of this plant exude an onion fragrance when cut or bruised. The bulbs have a strong flavor and can be eaten raw or parboiled. Early explorers ate them, but also used them to treat colds, coughs, and asthma, or to repel insects. Tolerant of hot and dry conditions, this North American native is suitable for rock gardens.

  • Grows up to 12-18 in. tall (30-45 cm) and 6-12 in. wide (15-30 cm). Will spread by self-seeding and bulb offsets.
  • Performs best in sandy or rocky, dry to medium, well-drained soils in full sun to light shade. Drought and dry soil tolerant.
  • Lovely in beds and borders, cottage gardens, rock gardens or prairies and meadows. To achieve an impressive visual effect, plant in clusters.
  • Generally pest and disease free. Attracts butterflies, but deer ignore it!
  • Deadhead spent flowers before seed set to help control any undesired self-seeding.
  • Propagate by seed or division of bulb cluster.
  • Native to North America.

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Requirements

Hardiness 3 – 8
Plant Type Bulbs, Perennials
Plant Family Alliums
Exposure Full Sun, Partial Sun
Season of Interest Summer (Mid,Late)
Fall
Height 1' – 2' (30cm – 60cm)
Spread 6" – 1' (15cm – 30cm)
Spacing 6" – 12" (15cm – 30cm)
Water Needs Low, Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants United States, Midwest, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, North Dakota, South Dakota, Wisconsin, Wyoming, Southeast, Arkansas, North Carolina, Tennessee, Southwest, Oklahoma, Texas
Tolerance Deer, Drought, Dry Soil, Rocky Soil
Attracts Butterflies
Garden Uses Beds and Borders
Garden Styles Gravel and Rock Garden, Informal and Cottage, Prairie and Meadow

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Justin Meissen, Cultivar 413 (Flickr), Chanticleer Garden

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 3 – 8
Plant Type Bulbs, Perennials
Plant Family Alliums
Exposure Full Sun, Partial Sun
Season of Interest Summer (Mid,Late)
Fall
Height 1' – 2' (30cm – 60cm)
Spread 6" – 1' (15cm – 30cm)
Spacing 6" – 12" (15cm – 30cm)
Water Needs Low, Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants United States, Midwest, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, North Dakota, South Dakota, Wisconsin, Wyoming, Southeast, Arkansas, North Carolina, Tennessee, Southwest, Oklahoma, Texas
Tolerance Deer, Drought, Dry Soil, Rocky Soil
Attracts Butterflies
Garden Uses Beds and Borders
Garden Styles Gravel and Rock Garden, Informal and Cottage, Prairie and Meadow

Great Plant Combination Ideas with Alliums

Guides with Alliums

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