Updated: June 4, 2022

Evening primrose (Oenothera biennis) is a biennial plant that belongs to the Onagraceae family. The plant is native to North America and is known for its beautiful yellow flowers that bloom in the evening. Evening primrose is often used for its medicinal properties, as it contains high levels of gamma-linolenic acid (GLA), an essential fatty acid. In this article, we will explore the different stages of growth of the evening primrose plant.

Stage 1: Germination

The first stage of growth for an evening primrose plant is germination. The seeds of the plant require light to germinate, so they are typically sown in late summer or early fall. The seeds will usually germinate within two to three weeks, provided they are kept moist and in a warm environment.

Stage 2: Vegetative Growth

Once the seed has germinated, the evening primrose plant will begin its vegetative growth stage. During this stage, the plant will develop leaves and establish a root system. The leaves of the evening primrose plant are lance-shaped and can grow up to 6 inches long. The plant can grow to be anywhere from 2 to 6 feet tall during this stage.

Stage 3: Flowering

The flowering stage is perhaps the most exciting stage of growth for any gardener. Evening primrose plants typically begin to flower in late spring or early summer of their second year. The flowers of the evening primrose are yellow and open in the evening, hence their name. They only bloom for one night before withering and falling off.

Stage 4: Seed Production

Once the flowers have bloomed and fallen off, the evening primrose plant will enter its seed production stage. During this stage, the plant will produce seed pods that contain numerous small seeds. The seed pods are usually 1 to 2 inches long and can contain anywhere from 100 to 500 seeds.

Stage 5: Dormancy

After the evening primrose plant has produced its seed pods, it will enter a dormant stage. During this stage, the plant will stop growing and conserve its energy for germination in the following year. The plant will typically die off after the second year, but the seeds it produces will germinate and begin the cycle anew.

Evening primrose plants are relatively easy to grow and care for. They prefer full sun to partial shade and well-draining soil. The plants should be watered regularly, especially during hot, dry weather.


Can evening primrose be grown indoors?

Yes, evening primrose can be grown indoors as long as they are given enough light and kept in a warm environment.

How long does it take for evening primrose plants to bloom?

Evening primrose plants typically begin to bloom in late spring or early summer of their second year.

What is the best time of year to plant evening primrose seeds?

Evening primrose seeds should be sown in late summer or early fall, as they require light to germinate.

Are evening primrose plants invasive?

Evening primrose plants can self-seed and spread quickly, so they should be monitored closely in the garden.

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