Oenothera biennis - Evening Primrose

 Sun Exposure: Sun, Part Sun

Soil Moisture: Medium-Wet, Medium, Medium-Dry, Dry

Soil Type: Loam, Sand, Clay

Height: 4 - 6 feet

Spread: 2 feet

Blooms: June, July, August, September, October, November

Root: Taproot

Habitat: Prairies, Thickets, Lakeshore Dunes, Roadsides, 

Landscape uses: Moon gardens, Pollinator garden, Naturalized areas, Meadow plantings

Wildlife Value: Flowers open at night and are primarily pollinated by moths. Host Plant: Primrose Moth, Pearly Wood Nymph, Grape Leaffolder Moth, White-Lined Sphinx

Seed Origin: Wasaga Beach, Ontario

Germination Code: A, D

Oenothera biennis - Evening Primrose

  • Evening Primrose is a showy biannual, sometimes flowering in the first year, but may use energy developing its rosette the first year and send up flowers the next. The flowers bloom throughout the growing season, and usually only open at night or on cloudy days. 

    The stunning pink Primrose Moth can complete its life cycle on the Evening Primrose plant.  The small green larvea of the Primrose Moth will feed on the flowers and seed of the plant and the adult moth can often be found resting on the yellow flowers, pollinating them in the process.