A stunning display for any garden and a magnet for pollinating insects, evening primrose (Oenothera biennis) blooms from late spring through late summer. The flowers open rapidly at dusk, providing an engaging spectacle, which gives the plant its name. Its nectar attracts a variety of beneficial insects, and the seeds are a valuable food source for birds.

The bright yellow blooms, measuring 2.5 to 5 cm in diameter, feature four bilobed petals. Though invisible to the human eye, the flowers have a distinct nectar guide pattern that appears under ultraviolet light, making it visible to pollinators like moths, butterflies, and bees.

Evening primrose is a versatile garden plant, suitable for borders and beds, and also works well as ground cover. It thrives in various garden styles, including meadow, rock, coastal, or woodland gardens.

Native to North and South America, evening primrose has spread across Europe and parts of Asia. Its yellow flowers open at sunset and close during the day. The seeds contain oil rich in omega-6 fatty acids, including gamma-linolenic acid (GLA), which is extracted for its medicinal properties.

Historically, Native Americans used evening primrose in poultices for bruises and wounds, and its stem and leaf juices as treatments for skin inflammations. The plant was also used to alleviate gastrointestinal issues and sore throats. In the 17th century, Europeans adopted evening primrose oil as a folk remedy, calling it the “King’s cure-all.”

Today, evening primrose oil is marketed as a dietary supplement for various conditions such as atopic dermatitis (eczema), rheumatoid arthritis, premenstrual syndrome (PMS), breast pain, and menopausal symptoms. It is also used in some topical skincare products.

Always consult a medical professional before using evening primrose oil or any supplements. The information provided here is not a substitute for medical advice. Never discontinue prescribed medications without first consulting a healthcare provider.

Grow Notes
Plant in full or part sun in moist, well-drained soil.

Drought tolerant once established.

Sow
Sow direct in Spring and Summer. Sow at 1mm depth with 40cm plant spacing.

Keep soil moist but never wet.

Germination
14-30 days at 18-21°C

Maturity
75-85 days.