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Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

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Ageratina occidentalis (Western snakeroot)
Bransford, W.D. and Dolphia

Ageratina occidentalis

Ageratina occidentalis (Hook.) King & H. Rob.

Western Snakeroot, Western Thoroughwort

Asteraceae (Aster Family)

Synonym(s): Eupatorium occidentale

USDA Symbol: AGOC2

USDA Native Status: L48 (N)

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.

 

From the Image Gallery

1 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Size Notes: Up to about 2 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: White , Red , Pink , Blue , Purple
Bloom Time: Jun , Jul , Aug , Sep , Oct

Distribution

USA: CA , ID , MT , NV , OR , UT , WA
Native Distribution: N. CA to c. WA, extreme w. MT & UT
Native Habitat: Open, rocky places; 6500-11,000 ft.

Growing Conditions

Light Requirement: Sun
Soil Description: Granitic rocks.

Propagation

Description: Propagate by division or seed.
Seed Treatment: Stratify.
Commercially Avail: yes

Web Reference

Webref 30 - Calflora (2018) Calflora
Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Ageratina occidentalis in USDA Plants
FNA: Find Ageratina occidentalis in the Flora of North America (if available)
Google: Search Google for Ageratina occidentalis

Metadata

Record Modified: 2022-10-31
Research By: TWC Staff

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