North America Native Plant

Plains Evening Primrose

Botanical name: Camissonia contorta

USDA symbol: CACO34

Life cycle: annual

Habit: forb

Native status: Native to Canada âš˜ Native to the lower 48 states  

Synonyms: Oenothera contorta Douglas ex Lehm. (OECO5)  âš˜  Oenothera cruciata (S. Watson) Munz, non Nutt. ex G. Don, nom. illeg. (OECR2)  âš˜  Oenothera dentata auct. non Cav. (OEDE8)   

Plains Evening Primrose: A Delightful Native Wildflower for Western Gardens If you’re looking for a charming native wildflower that puts on its best show when most other flowers are calling it a day, meet the plains evening primrose (Camissonia contorta). This delightful little annual brings a touch of magic to ...

Plains Evening Primrose: A Delightful Native Wildflower for Western Gardens

If you’re looking for a charming native wildflower that puts on its best show when most other flowers are calling it a day, meet the plains evening primrose (Camissonia contorta). This delightful little annual brings a touch of magic to western gardens with its habit of opening bright yellow blooms just as the sun begins to set.

What Makes Plains Evening Primrose Special

Plains evening primrose is a true native gem, naturally occurring across western North America from British Columbia down through California and eastward to Idaho and Nevada. As a member of the evening primrose family, this annual forb has mastered the art of timing – its cheerful yellow flowers unfurl in the evening and often stay open through the cooler morning hours.

You might also encounter this plant listed under its former scientific names, including Oenothera contorta, but regardless of what you call it, this native beauty deserves a spot in more western gardens.

Garden Appeal and Design Uses

Don’t expect towering drama from plains evening primrose – this is a plant that charms through subtlety rather than size. As an annual forb, it forms low-growing clumps that work beautifully as:

  • Ground cover in naturalized areas
  • Accent plants in native wildflower gardens
  • Components of drought-tolerant xeriscapes
  • Additions to meadow-style plantings

The small, delicate yellow flowers may be modest in size, but they’re perfectly formed and create a lovely carpet effect when planted in groups. Plus, there’s something undeniably romantic about a flower that saves its best performance for the evening hours.

Perfect Growing Conditions

One of the best things about plains evening primrose is its easygoing nature. This native wildflower thrives in conditions that might challenge more finicky plants:

  • Sunlight: Full sun is ideal
  • Soil: Well-drained sandy or gravelly soils work best
  • Water: Drought tolerant once established
  • Climate: Suitable for USDA zones 3-9

If you have a spot in your garden that’s a bit too dry or sandy for other plants, plains evening primrose might be exactly what you need.

Planting and Care Tips

Growing plains evening primrose is refreshingly straightforward. Since it’s an annual, you’ll be starting fresh each year, but the process couldn’t be simpler:

  • Seeding: Direct sow seeds in fall or early spring
  • Spacing: Scatter seeds in natural-looking drifts rather than formal rows
  • Watering: Provide occasional water during germination, then let nature take over
  • Maintenance: Minimal care needed once plants are established

The beauty of working with native annuals like this is that they often self-seed, creating natural colonies that return year after year without any effort from you.

Supporting Local Wildlife

While plains evening primrose may look delicate, it’s a hardworking member of the ecosystem. Its evening-blooming habit makes it particularly valuable for moths and other nocturnal pollinators that are often overlooked in garden planning. By including this native in your landscape, you’re supporting local wildlife and contributing to regional biodiversity.

Is Plains Evening Primrose Right for Your Garden?

This native wildflower is an excellent choice if you’re looking to:

  • Add native plants to your western garden
  • Create a low-maintenance wildflower area
  • Support nocturnal pollinators
  • Fill in dry, sandy spots where other plants struggle
  • Enjoy evening garden time with flowers that bloom when you do

Plains evening primrose won’t give you bold, showy blooms or dramatic height, but it will reward you with reliable beauty, ecological benefits, and the special pleasure of flowers that greet you at the end of each day. For western gardeners seeking authentic native character with minimal fuss, this little evening primrose is hard to beat.

Plains Evening Primrose

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Myrtales

Family

Onagraceae Juss. - Evening Primrose family

Genus

Camissonia Link - suncup

Species

Camissonia contorta (Douglas ex Lehm.) Kearney - plains evening primrose

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA