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Marcus, Joseph A.
Oenothera rhombipetala Nutt. ex Torr. & Gray
Diamond petal primrose, Four-Point Evening Primrose, Fourpoint evening-primrose, Greater four-point evening-primrose
USDA Symbol: oerh
USDA Native Status: Native to U.S.
As a biennial, this plant produces a rosette of leaves the first year and in the second year an erect, leafy stem 2-3 ft. tall. The loose flowering spike is composed of yellow, 2-3 in. flowers, each with four wide petals which taper to a blunt point. The flowers open in the evening and wither the following morning.
Often seen along roadsides. In the South this plant will continue to bloom through the summer if well watered.
Plant CharacteristicsDuration: Annual Habit: Herb Leaf Retention: Deciduous Size Notes:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: May , Jun , Jul , Aug , Sep
AR , IA , IL , KS , LA , MI , MN , MO , ND , NE , NM , OK , SC , SD , TX , WI Native Distribution:
Locally from n. IN to e. MN & s.w. SD, s. to TX; naturalized eastward Native Habitat:
Prairie, Plains, Meadows, Pastures, Savannahs, Woodlands edge, Opening USDA Native Status: L48(N)
Growing ConditionsWater Use: Low
Light Requirement: Sun , Part Shade
Soil Moisture: Dry
Soil Description: Sandy, Sandy Loam
Conditions Comments: This plant can be naturalized in a meadow but it is best in the garden where it receives summer water. It can be grown from seed sown in situ or transplanted when very small as it has a taproot. To bloom, it has to winter over, although it sometimes bloom the first spring. It seeds out best in bare areas and under parent plants so you may want to keep an area just for evening primroses. In the South this plant will continue to bloom through the summer if watered well.
BenefitUse Ornamental: Color, Attractive, Showy
Use Medicinal: Leaves used for poultice.
Conspicuous Flowers: yes
Nectar Source: yes
PropagationPropagation Material: Seeds
Description: Seed sown in fall
Seed Collection: Not Available
Seed Treatment: Not Available
Commercially Avail: yes
Maintenance: Prevent complete soil dryness, Remove spent blossoms, Maintain mulch layer, Fertilize in spring with rose food
Find Seed or Plants
Order seed of this species from Native American Seed and help support the Wildflower Center.
Find seed sources for this species at the Native Seed Network.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Native Seed Network
- Corvallis, OR
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Record Modified: 2008-05-24
Research By: DEW, JSC, WFS