// SPECIES PROFILE · SHRUB · NATIVE

Great ragweed

Ambrosia trifida var. trifida

Great ragweed (Ambrosia trifida var. trifida) is a shrub in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2a–11b. Mature size 58"–12'. Blooms Jun–Oct.

// QUICK FACTS

Family: —
Group: shrub
Native range: Native to 48 U.S. states, including AL, AR, AZ, CA, CO, CT…
USDA hardiness: Zones 2a–11b
Mature size: 58"–12'
Sun: Part shade
Water: —
Bloom: Jun–Oct
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Great ragweed (Ambrosia trifida var. trifida) — *Ambrosia trifida var. trifida* — Great ragweed. Photo via iNaturalist — (c) Eric Schmidt, some rights reserved (CC BY).

Field Notes

[ growing · ecology · siting · care ]

Great ragweed (Ambrosia trifida var. trifida) is a shrub in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2a–11b. Mature size 58"–12'. Blooms Jun–Oct.

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, great ragweed pairs naturally with: Smooth Sumac (Rhus glabra), Great ragweed (Ambrosia trifida), Texan great ragweed (Ambrosia trifida var. texana), Broadleaf Arrowhead (Sagittaria latifolia).