// SPECIES PROFILE · PERENNIAL · NATIVE

Tall thoroughwort

Eupatorium altissimum

Tall thoroughwort (Eupatorium altissimum) is a perennial in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–11b. Mature size 2'–5'. Blooms Jul–Sep.

// QUICK FACTS

Family: —
Group: perennial
Native range: Native to 31 U.S. states, including AL, AR, CT, DC, FL, GA…
USDA hardiness: Zones 2b–11b
Mature size: 2'–5'
Sun: —
Water: —
Bloom: Jul–Sep
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Tall thoroughwort (Eupatorium altissimum) — *Eupatorium altissimum* — Tall thoroughwort. Photo by Frank Mayfield from Chicago area, USA via Wikimedia Commons (CC BY-SA 2.0).

Field Notes

[ growing · ecology · siting · care ]

Tall thoroughwort (Eupatorium altissimum) is a perennial in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–11b. Mature size 2'–5'. Blooms Jul–Sep.

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, tall thoroughwort pairs naturally with: Broadleaf Arrowhead (Sagittaria latifolia), Butterfly Milkweed (Asclepias tuberosa), Cardinal Flower (Lobelia cardinalis), Common Blue Violet (Viola sororia).