// SPECIES PROFILE · ANNUAL · NATIVE

Whitest evening-primrose

Oenothera albicaulis

Whitest evening-primrose (Oenothera albicaulis) is a annual in the — family. Native range includes KS, OK. Hardy in zones 2a–10b. Mature size 6"–1'. Blooms Apr–Jul.

// QUICK FACTS

Family: —
Group: annual
Native range: Native to 15 U.S. states, including AZ, CO, IL, KS, MT, ND…
USDA hardiness: Zones 2a–10b
Mature size: 6"–1'
Sun: Full sun
Water: —
Bloom: Apr–Jul
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Whitest evening-primrose (Oenothera albicaulis) — *Oenothera albicaulis* — Whitest evening-primrose. Photo by Jim Pisarowicz via Wikimedia Commons (Public domain).

Field Notes

[ growing · ecology · siting · care ]

Whitest evening-primrose (Oenothera albicaulis) is a annual in the — family. Native range includes KS, OK. Hardy in zones 2a–10b. Mature size 6"–1'. Blooms Apr–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, whitest evening-primrose pairs naturally with: Common Sunflower (Helianthus annuus), Swamp verbena (Verbena hastata), Annual ragweed (Ambrosia artemisiifolia var. artemisiifolia), Field sagewort (Artemisia campestris).