Rosy evening primrose
Oenothera rosea · Onagraceae
The gardener's calendar
Ideal time to plant rosy evening primrose: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Scientific name
- Oenothera rosea
- Family
- Onagraceae
- Plant type
- Annual or biennial herbaceous plant
- Flowering
- June to September, pink to red flowers
- Mature size
- 30 to 60 cm tall
- Light exposure
- Full sun to partial shade
- Hardiness
- Low hardiness, sensitive to frost
- Origin
- North and Central America
Care
Light Exposure
Sunflower evening primrose thrives in full sun for generous flowering and intense colors. It tolerates partial shade but will flower less abundantly. Place it in a well-ventilated spot, protected from strong winds that can damage its fragile stems.
Soil and Planting
This plant prefers light, well-draining soil that is poor to moderately fertile. It adapts well to dry conditions and tolerates rocky or sandy soils. Avoid overly moist or compacted soils that encourage root rot.
Watering
Water regularly for the first few weeks after planting to establish roots. Once established, sunflower evening primrose tolerates drought well and only needs moderate watering during prolonged dry periods. Reduce watering in autumn.
Fertilization
Enrich the soil at planting time with well-decomposed compost. This hardy plant doesn't require regular fertilizing; a balanced fertilizer application in spring is plenty to support growth and flowering.
Pruning and Maintenance
Pinch the tips of young plants to encourage a compact, branched shape. Remove spent flowers regularly to extend the flowering period. At the end of the season, cut the stems back to ground level or leave them to dry on the plant for natural seed production.
Diseases and Pests
Sunflower evening primrose is generally robust and rarely suffers from diseases under appropriate growing conditions. Watch for excess moisture which can promote rot. Aphids may sometimes colonize it in spring; a water spray is often enough to eliminate them.
Did you know?
Sunflower evening primrose is called "Evening Beauty" in some regions because its flowers open particularly in late afternoon and early evening. This fascinating behavior, called "nycthism," is an ancestral adaptation to attract nocturnal pollinators. The Oenothera genus long fascinated early 20th-century geneticists, notably Hugo de Vries, who discovered spectacular spontaneous mutations in it, revolutionizing our understanding of heredity.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Pink evening primroseOenothera speciosa
- Hummingbird trumpetEpilobium canum
- Hardy fuchsiaFuchsia magellanica
- Evening primroseOenothera fruticosa
- Bolivian fuchsiaFuchsia boliviana
- ClockweedOenothera lindheimeri
Tips generated and checked by Viridia — adapt them to your local climate.