Evening primrose (Oenothera affinis)
Care, watering, light and tips for Evening primrose on Floravia.
Quick facts
- Family: Onagraceae
- Difficulty: Easy to care for
- Watering: every 7 days
- Light: Partial shade
- Temperature: 10–30 °C
About Evening primrose
Oenothera affinis, commonly known as longflower evening primrose, is a perennial or biennial herbaceous plant native to South America, valued for its large, fragrant yellow flowers that open at dusk. Its upright stems and lanceolate leaves form attractive foliage, reaching up to 60 cm in height. It is ideal for rock gardens, path borders, or moon gardens, where its nocturnal blooms can be fully enjoyed.
Native range
South America, especially in Argentina, Chile, Uruguay, and Southern Brazil.
Care tips
It thrives in full sun for abundant flowering, though it can tolerate some partial shade. It requires well-drained, sandy or slightly clayey soil, and is quite drought-tolerant once established, so watering should be moderate. Avoid overwatering, as it is susceptible to root rot in waterlogged soils. Deadheading spent flowers can encourage continuous blooming.
How to save a dying Evening primrose
- Warning signs
- Yellowish or reddish leaves, general wilting, lack of flowering.
- First aid
- Check soil drainage and moisture. Ensure full sun and deadhead spent flowers.
- What kills it
- Overwatering causing root rot or excessive shade.
- Can it be saved?
- Yes, if roots are not completely rotted and it receives proper care.