 It grows on clay soils including serpentine, at elevations up to 1100 m.

"Allium unifolium", despite its name, usually has 2-3 flat leaves up to 50 cm long.Bulbs, though, are usually solitary, egg-shaped, up to 2 cm long, often formed at the end of rhizomes spreading out from the parent plant.Scapes are round in cross-section, up to 80 cm tall.