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Growing Guides

Evening Primrose

Evening Primrose - Organo Republic

Evening Primrose, scientifically known as Oenothera biennis, is a beautiful flowering plant with large, showy yellow flowers that bloom in the evening. It is named "evening primrose" because the flowers open at dusk and close by the next morning. The plant has a biennial life cycle, meaning it completes its life cycle in two years.

Origin: Evening Primrose is native to North America.

Usage: Evening Primrose is often grown for its ornamental value and its medicinal properties. The flowers attract pollinators like bees and butterflies, and the seeds are used in herbal remedies and oil extraction.

Interesting facts: Evening Primrose oil, extracted from the plant's seeds, is known for its high content of gamma-linolenic acid (GLA), an essential fatty acid that offers various health benefits. The flowers of Evening Primrose are also edible and can be used in salads or as a garnish.



General requirements: Evening Primrose is a hardy plant that is relatively easy to grow.

Temperature and Light: It thrives in full sun to partial shade. Evening Primrose prefers moderate temperatures, with an optimal range of 60°F to 75°F (15°C to 24°C). It can tolerate heat and dry conditions.

Soil: It adapts well to various soil types but prefers well-draining soil with a pH range of 5.5 to 7.5. Sandy or loamy soils are ideal. Amend heavy clay soils with organic matter to improve drainage.

Water: Evening Primrose has moderate water needs. Water the plants regularly, keeping the soil evenly moist but not waterlogged. During periods of drought, provide supplemental watering to prevent stress.

Planting: Sow Evening Primrose seeds directly outdoors in early spring or late summer. Prepare the planting area by loosening the soil and removing any weeds or debris. Scatter the seeds on the soil surface and lightly press them into the soil. Keep the seeds consistently moist until germination occurs, usually within 10-15 days.

Spacing: Space the plants about 12-18 inches apart to allow for proper growth and airflow.

Maintenance: Evening Primrose requires minimal maintenance. Remove weeds that compete with the plants for nutrients and water. Apply a layer of organic mulch around the plants to help retain moisture and suppress weed growth.

Fertilizer: Evening Primrose doesn't require heavy fertilization. If your soil is poor, you can apply a balanced, all-purpose fertilizer once in early spring. Avoid excessive nitrogen fertilization, as it can promote lush foliage but fewer flowers.

Pests and Diseases: Evening Primrose is generally resistant to pests and diseases. However, keep an eye out for aphids and caterpillars. Use organic pest control methods if necessary.



Harvesting: The flowers of Evening Primrose can be harvested when they are fully open in the evening. Cut the flowers carefully using sharp scissors or pruners, leaving a short stem attached. Enjoy the flowers fresh or use them in floral arrangements.

Seed Saving: Allow some flowers to remain on the plant and go to seed. As the seed pods mature, they will turn brown and dry out. Once the pods start to crack open, gently collect the seeds and remove any chaff or debris. Store the seeds in a cool, dry place in labeled envelopes or airtight containers for future planting.



  • Common name: Evening Primrose
  • Latin name: Oenothera biennis
  • Growth habit: Upright, biennial
  • Life cycle: Biennial
  • USDA Zones: 3-9
  • Seeds per ounce: Approximately 20,000
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