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Biennial evening primrose

Name: Biennial evening primrose
Brand: Akène
Price: 4.99 CAD
Availability: InStock

Common name Common Evening Primrose

Latin name Oenothera biennis

Quantity per packet Minimum of 300 seeds

This native biennial greatly enhances biodiversity by attracting pollinators throughout its long flowering season. It is also an excellent choice for edible gardens and low-maintenance naturalized landscapes.

Product information

Product
identification

Common nameCommon Evening Primrose

Latin nameOenothera biennis

FamilyOnagraceae

TypeBiennial flower

CycleBiennial

Quantity per packMinimum of 300 seeds

Code produitAKENE-0060

Product
description

Common Evening Primrose (Oenothera biennis) is a remarkable native biennial that brings color, biodiversity, and practical value to the garden. Its large bright yellow flowers open mainly in the evening, creating a fascinating display while attracting many pollinators, including bees, butterflies, and night-flying insects. Its upright form and abundant bloom make it an excellent choice for naturalistic gardens, wildflower meadows, and wildlife-friendly landscapes. Hardy and well adapted to Canadian conditions, this resilient species thrives even in poor soils where many other plants struggle to establish.

Common Evening Primrose is easy to grow in full sun and well-drained sandy to loamy soil. Once established, it tolerates drought well, making it ideal for difficult, low-maintenance sites. During its first year, it forms a strong rosette of leaves before producing tall flowering stems the following season, often reaching over 1 m (3 ft) in height. Its natural habit allows it to self-seed readily, helping it return to the garden year after year with little effort.

Beyond its ornamental value, Common Evening Primrose has a long history of edible and traditional uses. Its young leaves, flowers, and roots can be used at different stages of growth, while its seeds are known for their oil content and long-standing traditional applications. Paired with native perennials such as Wild Bergamot, Black-eyed Susan, Penstemons, and Goldenrods, Oenothera biennis creates nectar-rich, colorful, biodiversity-friendly plantings. This versatile plant is an excellent choice for gardeners who want to combine beauty, usefulness, and ecological value in their landscapes.

Sowing
guide

Sowing periodAutumn or spring after cold stratification

Best time

Autumn or spring

Sowing depthSurface sow

Spacing / density

45 to 60 cm (18 to 24 in)

Germination temperature18 to 22°C (64 to 72°F)

Germination time15 to 30 days

Propagation

Propagation is primarily by seed. This species readily self-sows when mature seed capsules are left on the plant.

Growing
method

Surface sow Common Evening Primrose seeds or cover them only very lightly, as light improves germination. Autumn sowing or a short cold stratification before spring sowing generally improves emergence. Maintain temperatures between 18 and 22°C (64 to 72°F) with light, even moisture until germination, which usually occurs within 15 to 30 days. Transplant seedlings once they are large enough to handle into poor to moderately fertile, well-drained soil in full sun to partial shade. This hardy native species readily adapts to Canadian growing conditions and often self-seeds naturally when conditions are favorable.

Soil
and care

ExposureFull sun to partial shade

Soil

Poor to moderately fertile, sandy to loamy, well-drained soil. This species thrives where many other plants struggle and tolerates drought exceptionally well.

Soil pHAcidic to neutral

Watering

Light to moderate watering is sufficient, as this species tolerates dry soils well once established. Avoid excessive moisture, which may hinder taproot development.

Fertilization

A light application of compost in spring is generally sufficient. Rich soils encourage excessive foliage growth at the expense of flowering and seed production.

Care levelLow

In spring, thin young rosettes to provide adequate spacing for vigorous plants. During summer, water only during prolonged drought, as this species thrives in relatively dry conditions. Remove spent flower stalks if you wish to reduce self-seeding, or leave them in place to harvest seeds. In autumn, second-year plants naturally complete their life cycle after seed production. This species requires very little maintenance when grown in suitable conditions.

Container
growing

Recommended pot size

20 to 30 L (5 to 8 gal)

Container growing is possible in a deep pot of at least 20 to 30 L (5 to 8 gal) filled with a light, well-drained growing medium. Because this species develops a long taproot, sufficient depth is essential for healthy growth. Place the container in full sun and avoid excessive watering to recreate its preferred natural habitat. Container culture allows gardeners to enjoy its fragrant yellow flowers while attracting pollinators close to patios and outdoor living spaces.

Bloom,
harvest
and garden

Its fragrant yellow flowers open in the evening and attract an impressive diversity of both day- and night-active pollinators. This species also offers valuable edible and traditional uses, making it an outstanding choice for ecological gardens.

Garden use

Common Evening Primrose is ideal for pollinator gardens, medicinal gardens, and naturalistic landscapes. Its bright yellow flowers attract bees, butterflies, and numerous night-flying pollinators throughout summer. It blends beautifully with Black-eyed Susans, Wild Bergamot, and Goldenrods in prairie-inspired plantings. Its ability to thrive in poor soils also makes it an outstanding choice for difficult sites and ecological restoration projects.

Bloom period

Large fragrant yellow flowers open mainly in the evening and remain highly attractive to pollinators. Blooming continues throughout summer into early autumn.

Flower colorBright yellow

Foliage colorGreen

Harvest

Flowers may be harvested throughout summer for culinary use. Seeds are generally collected from late summer through early autumn when fully mature.

Fruiting

Seed capsules produce large quantities of oil-rich seeds that mature in late summer and naturally renew populations through self-seeding.

Wildlife appealBees and butterflies

Size
and facts

Height1 to 1.5 m (3.3 to 5 ft)

Spread30 to 45 cm (12 to 18 in)

Growth rateModerate

Hardiness zoneUSDA Zones 3–8

Minimum temperature-40°C (-40°F)

Foliage typeDeciduous

Papillonstrue

Insectes utilestrue

Résistant aux cerfstrue

Pet friendlytrue

Planting
partners

Good companions

Black-eyed Susan, Wild Bergamot, Goldenrod, Hairy Beardtongue

Avoid planting with

Northern Blue Flag Iris, Marsh Marigold, Ligularia, Horsetail

Recipe
and inspiration

Young leaves, first-year roots, and flowers are edible when harvested at the proper stage. The flowers can be added to salads for a decorative touch and mild sweetness, while the roots were traditionally eaten as a vegetable. The seeds are valued for their rich oil content and are the source of the well-known evening primrose oil. This versatile native plant is also highly prized in medicinal and edible gardens while supporting biodiversity.

Frequently asked questions

When should I sow Common Evening Primrose seeds? +

Common Evening Primrose seeds can be sown directly outdoors in autumn or in spring after a short period of cold stratification. This improves germination and produces stronger seedlings.

Is Common Evening Primrose edible? +

Yes. The young leaves, flowers, and first-year roots are edible. This species has been cultivated for generations for both culinary and traditional uses.

Why does Common Evening Primrose attract so many pollinators? +

Its large yellow flowers open in the evening and produce abundant nectar, attracting bees, moths, butterflies, and many other beneficial pollinating insects.

Can I harvest the seeds? +

Yes. The seeds can be harvested once mature in late summer or early autumn for future sowing or for their traditionally valued oil content.

Is Common Evening Primrose easy to grow? +

Yes. Common Evening Primrose is a hardy, low-maintenance biennial that thrives in poor soils and often self-seeds naturally once established.

The availability of our seeds varies depending on seasonal availability, production schedules and supplier inventory. Certain varieties may only be offered for a limited time based on their natural growth cycle, sowing period or available stock. These product pages are designed to help and inspire gardeners in choosing the right seeds for vegetable gardens, flower beds, pollinator gardens, container growing, naturalization projects and sustainable outdoor spaces.