// SPECIES PROFILE · ANNUAL · NATIVE

Canadian horseweed

Conyza canadensis var. glabrata

Canadian horseweed (Conyza canadensis var. glabrata) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 1a–11a. 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 1a–11a
Mature size: 29"–6'
Sun: Full sun
Water: Medium
Bloom: Jul–Nov
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Canadian horseweed (Conyza canadensis var. glabrata) — *Conyza canadensis var. glabrata* — Canadian horseweed. Photo via iNaturalist — (c) Zihao Wang, some rights reserved (CC BY), uploaded by Zihao Wang.

Field Notes

[ growing · ecology · siting · care ]

Canadian horseweed (Conyza canadensis var. glabrata) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 1a–11a. 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, canadian horseweed pairs naturally with: Common Sunflower (Helianthus annuus), Swamp verbena (Verbena hastata), Annual ragweed (Ambrosia artemisiifolia var. artemisiifolia), Lambsquarters (Chenopodium album).