Plant Name: Ageratina occidentials ( Aster Family)
Common names: Western Snakeroot, Western Joe Pye Weed

This low subshrub, which rarely grows taller than 2 ft., is covered with short, broad, pointed, bright green aromatic leaves topped by masses of red-purple flower heads.

Plant Characteristics: Perennial Herb
Size: 1-3 ft.
Bloom Color: Red, Purple
Bloom Time: July, Aug , Sep
Light Requirement: Sun
Water use: medium – high
Propagation Description: Propagate by division or seed
Note Seed Treatment: Stratify
Native to: Western United States
Native Habitat: Open, rocky places; 6500-11,000 ft.
Host plant to: Hitched Arches Moth (Melanchra adjuncta)

https://www.wildflower.org/plants/