// SPECIES PROFILE · ANNUAL · NATIVE

Stemless evening-primrose

Oenothera triloba

Stemless evening-primrose (Oenothera triloba) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 3a–10a. Mature size 1"–8". Blooms Feb–May.

// QUICK FACTS

Family: —
Group: annual
Native range: Native to 17 U.S. states, including AL, AR, IL, IN, KS, KY…
USDA hardiness: Zones 3a–10a
Mature size: 1"–8"
Sun: Full sun
Water: —
Bloom: Feb–May
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Stemless evening-primrose (Oenothera triloba) — *Oenothera triloba* — Stemless evening-primrose. Photo by Mason Brock (Masebrock) via Wikimedia Commons (Public domain).

Field Notes

[ growing · ecology · siting · care ]

Stemless evening-primrose (Oenothera triloba) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 3a–10a. Mature size 1"–8". Blooms Feb–May.

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, stemless evening-primrose pairs naturally with: Black-Eyed Susan (Rudbeckia hirta), Common Sunflower (Helianthus annuus), Partridge pea (Chamaecrista fasciculata var. fasciculata), Louisiana devil's-claw (Proboscidea louisianica).