Known by many common names such as western snakeroot, western joepiweed, western eupatorium, and western boneset, this species is related to eastern joepiweed that is a common horticultural plant. Western joepiweed grows in rocky places at low, mid, and high elevations. At low elevations it tends to grow on rock cobble along streams. A rhizomatous plant in the aster family, western joepiweed has white to pink flowers that are favored by pollinators. Rarely grows taller than 2′.
Ageratina occidentalis seed packets contain 1/4 teaspoon of seed.
Seed Germination Instructions
No pretreatment required. Sow outside in fall to early spring. Germination may be improved with 30 days cold stratification.