Photo by Melody

PlantFiles: Slender Evening Primrose
Oenothera heterophylla var. rhombipetala

Family: Onagraceae (on-uh-GRAY-see-ee) (Info)
Genus: Oenothera (ee-no-THEE-ruh) (Info)
Species: heterophylla var. rhombipetala

Synonym:Oenothera rhombipetala
Synonym:Raimannia rhombipetala

3 members have or want this plant for trade.


12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

9-12 in. (22-30 cm)
12-15 in. (30-38 cm)
15-18 in. (38-45 cm)

Not Applicable

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:
Bright Yellow

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall


Other details:
Flowers are fragrant
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored

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1 positive
1 neutral
No negatives

Gardeners' Notes:

Positive 1e9l3h7 On Jul 11, 2010, 1e9l3h7 from Rio Rancho, NM wrote:

brought seed from Illinois maybe ten years ago.came up and bloomed first season then vanished last year they were back this year they have spread to a larger area.

Ed rio rancho

Neutral Weezingreens On Jan 21, 2005, Weezingreens from Seward, AK (Zone 3b) wrote:

Oenothera rhombipetala, also known as Four Point Evening Primrose is native to the sandy prairies of North America. The flowers open in the evening and close in the morning. They are pollinated by moths. They are frequently seen along sandy soiled roadsides.


This plant has been said to grow in the following regions:

Rio Rancho, New Mexico

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