Diamond Petal Primrose
Oenothera rhombipetala
Last reviewed: October 2026
Toxicity unknown
Diamond Petal Primrose (Oenothera rhombipetala) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
low
Size
36"–60" H × 24"–36" W
Bloom
Jun, Jul, Aug
Native to
AR, CO, IA, IL and 13 more states
Pollinators
bees, moths, beetles, hummingbirds
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 459 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaPicture natives in your own yard
Upload a photo of your yard and Patch Vision shows a rendering of it planted with natives for your region, like Diamond Petal Primrose.
Browse plants for this ecoregion
Four-points evening-primrose is a drought-tolerant biennial that produces bright yellow flowers with distinctive diamond-shaped petals from June through August. This native wildflower grows 12-36 inches tall and thrives in full sun with minimal water needs once established.
In an HOA neighborhood
Diamond Petal Primrose takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Biennial lifecycle creates gaps when plants die after second year
- Can appear weedy or unkempt when not in bloom
- Evening-blooming habit means flowers may be closed during day
Wildlife value
The evening-blooming flowers attract night-flying moths and sphinx moths, while also providing nectar for bees and beetles during daytime hours.
Common questions
- How much sun does Diamond Petal Primrose need?
- Diamond Petal Primrose grows best in full sun conditions.
- When does Diamond Petal Primrose bloom?
- Diamond Petal Primrose blooms in June, July, and August.
- Where is Diamond Petal Primrose native?
- Diamond Petal Primrose (Oenothera rhombipetala) is native to AR, CO, IA, IL and 13 more states, per the World Checklist of Vascular Plants (Kew).
- What pollinators does Diamond Petal Primrose attract?
- Diamond Petal Primrose draws bees, moths, beetles, and hummingbirds.
- Is Diamond Petal Primrose HOA-friendly?
- Diamond Petal Primrose takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Diamond Petal Primrose? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.