// SPECIES PROFILE · ANNUAL · NATIVE

Horseweed

Conyza canadensis

Horseweed (Conyza canadensis) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2a–11b. Mature size 29"–6'. Blooms Jul–Nov.

// QUICK FACTS

Family: —
Group: annual
Native range: Native to 49 U.S. states, including AL, AR, AZ, CA, CO, CT…
USDA hardiness: Zones 2a–11b
Mature size: 29"–6'
Sun: Full sun
Water: Medium
Bloom: Jul–Nov
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Horseweed (Conyza canadensis) — *Conyza canadensis* — Horseweed. Photo by Meteorquake via Wikimedia Commons (CC BY 4.0).

Field Notes

[ growing · ecology · siting · care ]

Horseweed (Conyza canadensis) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2a–11b. Mature size 29"–6'. Blooms Jul–Nov.

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, horseweed pairs naturally with: Common Sunflower (Helianthus annuus), Swamp verbena (Verbena hastata), Annual ragweed (Ambrosia artemisiifolia var. artemisiifolia), Lambsquarters (Chenopodium album).