Evening primrose

Evening Primrose (Oenothera biennis) is a hardy biennial or short-lived perennial wildflower known for its striking yellow blooms that open in the evening and stay open overnight. This charming plant adds a splash of colour to Irish gardens from late spring through summer and is a magnet for moths and night-time pollinators.

Thriving in full sun and well-drained soils, Evening Primrose is tolerant of poorer soil conditions and drought once established. It is ideal for wildflower meadows, cottage gardens, and pollinator-friendly landscapes.

Botanical Name: Oenothera biennis

Type: Biennial / short-lived perennial

Height: 60–120 cm (24–48 inches)

Bloom Time (Ireland): June to September

Flower Colour: Bright yellow

Position: Full sun preferred

Soil Requirements: Well-drained soil, tolerates poor soils

Spacing: 30–45 cm apart

Irish Growing Tips: Sow seeds direct outdoors in spring or autumn. Prefers a sunny, sheltered location. Self-seeds readily, making it great for naturalised planting.

Note on Irish Climate Suitability:
Evening Primrose thrives in Ireland’s temperate climate and is well adapted to local soil and weather conditions. Its evening blooms provide unique garden interest and support nocturnal pollinators.

Historical & Ecological Note:
Native to North America, Evening Primrose has been embraced in European gardens for its beauty and ecological benefits. Its oil-rich seeds have been used traditionally for medicinal purposes, and it remains a valuable plant for biodiversity.