Scientific: Oenothera cespitosa (Synonym: Oenothera caespitosa)
Common: tufted evening primrose, fragrant evening primrose
Family: Onagraceae
Origin: Western United States and northern Mexico at elevations ranging from 4,000 to 7,500 feet.
Pronounciation: O-en-o-THER-a ces-pi-TOE-sa
Hardiness zones
Sunset All zones
USDA All zones
Landscape Use: Small, floral accent plant for oasis and xeric landscape border plantings, rock gardens, containers, and hanging baskets.
Form & Character: Clumping, informal, free, interesting, colorful.
Growth Habit: Evergreen, herbaceous, broadleaf perennial subshrub, prostrate, rosetting, clumping eventually to 1-foot height with almost a 2-feet spread.
Foliage/Texture: Variable, light gray green leaves, sometimes serrate, pubescent, prominent midvein, spatulate, 4-inches long; medium texture.
Flowers & Fruits: Relatively large, solitary, axillary white flowers to 3-inches across with nearly fused petals, slightly tinged with pink, fruit inconspicuous.
Seasonal Color: Tufted evening primrose grows a mass display of flowers in the spring.
Temperature: Fully tolerant.
Light: Full sun best.
Soil: Tolerant of various soil conditions including mild alkalinity, but soils must be well-drained.
Watering: Supplemental irrigation during hot weather will maintain healthy appearance.
Pruning: None required (coarsely translated...."its best to leave this puppy alone").
Propagation: Seed, division, or root cuttings.
Disease and Pests: None
Additional comments: Tufted evening primrose is a nice, diminutive 'western' native plant for informal landscape borders and flower garden settings.
Taxonomic tidbits: Oenothera is derived from the greek words oinos (wine) and thera (to imbibe or drink up). Oddly, some European plants in this genus were once thought to provoke a taste for wine.