// SPECIES PROFILE · PERENNIAL · NATIVE

White snakeroot

Ageratina altissima

White snakeroot (Ageratina altissima) is a perennial in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–11b. Mature size 6"–4'. Blooms Jul–Nov.

// QUICK FACTS

Family: —
Group: perennial
Native range: Native to 38 U.S. states, including AL, AR, CT, DC, DE, FL…
USDA hardiness: Zones 2b–11b
Mature size: 6"–4'
Sun: Part shade
Water: Low · xeric
Bloom: Jul–Nov
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

White snakeroot (Ageratina altissima) — *Ageratina altissima* — White snakeroot. Photo by Sten Porse via Wikimedia Commons (CC BY-SA 3.0).

Field Notes

[ growing · ecology · siting · care ]

White snakeroot (Ageratina altissima) is a perennial in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–11b. Mature size 6"–4'. Blooms Jul–Nov. Low water use makes it a strong candidate for xeric and drought-conscious plantings.

Why it's on this list: native species profile. Native-range data from the Lady Bird Johnson Wildflower Center (NPIN), cross-checked against iNaturalist observations. Part of Rooted Revival's regional native plant catalog — true natives for Oklahoma, Arkansas, Missouri and Kansas.

Companion Planting

[ guild · polyculture · cross-layer pairings ]

In the same native range, white snakeroot pairs naturally with: Broadleaf Arrowhead (Sagittaria latifolia), Common Blue Violet (Viola sororia), Common Boneset (Eupatorium perfoliatum), Common Evening Primrose (Oenothera biennis).