Prairie Onion (Allium stellatum) | Prairie Restorations

Prairie Onion

Allium stellatum

Allium stellatum, or Prairie Onion, is a perennial herb that reaches 8 to 18 inches in height. It features narrow, grass-like leaves and produces umbels of star-shaped, pink to lavender flowers from mid to late summer. This plant thrives in prairies, rocky outcrops, and dry fields, preferring well-drained, sandy or rocky soils. Historically, it was used by Native Americans for culinary and medicinal purposes. In landscaping, Prairie Onion is appreciated for its ornamental flowers and drought tolerance, making it suitable for rock gardens and xeriscaping.

Characteristics

Product Form	Plant, Seed
Type	Forb
Sun	Full Sun, Partial Sun
Soil	Sand/Gravel, Calcareous
Moisture	Dry, Mesic
Average Max Height (inches)	15
Suggested Plant Spacing (inches)	10
Bloom month(s)	July, August
Bloom Color or Type	Varies
Dominance	Low

Range Maps

Sowing Information

Sow seed onto a firm, weed-free seedbed. Hand-broadcast seed making two perpendicular passes for even coverage. If planting a mix, broadcast the grass component first and lightly rake/drag it into the top 1/8–1/4" of soil. Next, broadcast wildflower/forb seed and press it into the soil surface (with a roller/cultipacker or the back of a rake) to ensure good seed-to-soil contact. After seeding, apply a very light layer of clean, seed-free straw (or other weed-free, site-appropriate mulch) to reduce erosion and retain moisture without smothering seedlings. A good rainfall or thorough watering will help settle seed and mulch and improve germination.

Planting Information

Dig a hole in your planting site slightly larger than the plant’s root system. When placing the plant into the hole, ensure that the soil line remains consistent with its original level in the pot. Fill in around the roots with the excavated soil, gently firming it to eliminate air pockets. Water the plant thoroughly the same day to promote successful establishment.