// SPECIES PROFILE · ANNUAL · NATIVE

Ragweed

Ambrosia bidentata

Ragweed (Ambrosia bidentata) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–10a. Mature size 6"–3'. Blooms Jul–Oct.

// QUICK FACTS

Family: —
Group: annual
Native range: Native to 24 U.S. states, including AL, AR, CT, GA, IA, IL…
USDA hardiness: Zones 2b–10a
Mature size: 6"–3'
Sun: —
Water: —
Bloom: Jul–Oct
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Ragweed (Ambrosia bidentata) — *Ambrosia bidentata* — Ragweed. Photo via Wikimedia Commons (Public domain).

Field Notes

[ growing · ecology · siting · care ]

Ragweed (Ambrosia bidentata) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–10a. Mature size 6"–3'. Blooms Jul–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, ragweed pairs naturally with: Black-Eyed Susan (Rudbeckia hirta), Common Sunflower (Helianthus annuus), Tall Thistle (Cirsium altissimum), Partridge pea (Chamaecrista fasciculata var. fasciculata).