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PlantSnap
Plant Care
Common evening-primrose
(Oenothera biennis)
Also Known As
Common evening-primrose, Evening primrose, Oenothera, Evening star
About This Plant
Oenothera biennis is a biennial plant species that is part of the Onagraceae family. The plant is known for its yellow flowers that bloom in the evening and are pollinated by moths. It is native to North America and is commonly referred to as the common evening primrose or evening star.
Plant Care Instructions
Outdoor Size Range
24-48 inches (61-122 cm)
Light Requirements
Oenothera biennis requires full sun exposure to partial shade. It is recommended to provide at least 6 hours of sunlight per day.
Humidity Needs
The plant prefers average to low humidity levels.
Fertilizing Schedule
The plant does not require frequent fertilization. A balanced fertilizer can be applied once a month during the growing season.
Pruning Guidelines
The plant does not require frequent pruning. Deadheading can be done to promote continuous blooming.
Common Pests and Diseases
Common pests that affect Oenothera biennis include aphids, spider mites, and caterpillars. Diseases that affect the plant include powdery mildew and rust.
Indoor Size Range
12-36 inches (30-91 cm)
Watering Schedule
The plant requires moderate watering. The soil should be kept moist but not waterlogged. It is important to avoid overwatering as it can lead to root rot.
Temperature Range
Oenothera biennis can tolerate a wide range of temperatures, from -40°F to 100°F (-40°C to 38°C).
Growing Season
The growing season for Oenothera biennis is from spring to fall.
Growing Difficulty Level
Oenothera biennis is relatively easy to grow and maintain.
USDA Hardiness Zones
Oenothera biennis can grow in USDA hardiness zones 3 to 9.
Did You Know?
The roots, leaves, and seeds of Oenothera biennis have been used for medicinal purposes by Native Americans for centuries. The oil extracted from the seeds is believed to have anti-inflammatory properties and is used to treat skin conditions such as eczema and acne.
