// SPECIES PROFILE · PERENNIAL · NATIVE

Western poison ivy

Toxicodendron rydbergii

Western poison ivy (Toxicodendron rydbergii) is a perennial in the — family. Native range includes KS, OK. Hardy in zones 2a–10b. Mature size 4'–10'. Blooms May–Jul.

// QUICK FACTS

Family: —
Group: perennial
Native range: Native to 36 U.S. states, including AZ, CO, CT, DE, IA, ID…
USDA hardiness: Zones 2a–10b
Mature size: 4'–10'
Sun: Part shade
Water: —
Bloom: May–Jul
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Western poison ivy (Toxicodendron rydbergii) — *Toxicodendron rydbergii* — Western poison ivy. Photo by Dave Powell, USDA Forest Service, Bugwood.org (cropped by the uploader) via Wikimedia Commons (Public domain).

Field Notes

[ growing · ecology · siting · care ]

Western poison ivy (Toxicodendron rydbergii) is a perennial in the — family. Native range includes KS, OK. Hardy in zones 2a–10b. Mature size 4'–10'. Blooms May–Jul.

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, western poison ivy pairs naturally with: Broadleaf Arrowhead (Sagittaria latifolia), Lady Fern (Athyrium filix-femina), Wild Strawberry (Fragaria virginiana), Yarrow (Achillea millefolium).