perennialN. America Native

Evening Primrose

Oenothera biennis

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

36 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Low to moderate

Humidity

Average

Lifespan

Biennial

Native To

North America

Toxicity

Non-toxic

The Story

Plant Bio

Evening Primrose is a biennial plant known for its tall, upright growth and bright yellow flowers that open at dusk. Its flowers attract nocturnal pollinators such as moths and are known for self-seeding.

Bloom Period:

EarlyLate

Uses & Benefits:

Oenothera biennis provides tall, vibrant yellow flowers that attract pollinators and add a natural, wildflower aesthetic to gardens.

Its seeds can be harvested for oil production, and the plant offers erosion control in sunny, dry areas.

Supports bees, butterflies, and other pollinators, promoting local biodiversity.

Marketplace

Where to Buy

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Planting

How to Grow

Tuck seeds into well-draining soil in early spring.
Mist cuttings regularly to maintain humidity and encourage root growth.
Water deeply once a week during dry spells for healthy development.
Fertilize with a balanced organic fertilizer in spring and midsummer.
Prune dead or damaged stems in late fall to promote new growth.
Mulch around plants to retain moisture and suppress weeds.

Pro Tip

Plant in full sun for best flowering and ensure good soil drainage.

Keep It Thriving

Care Guide

Do

Water regularly during dry periods 🌱
Deadhead spent flowers to prolong bloom
Apply organic compost annually

Don't

Overwater to avoid root rot ❌
Ignore weeds that compete for nutrients
Prune in late winter when plants are dormant

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Propagate
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wildflower meadow with airy, purple bloomsSunny border with tall, waving stems

Companion Plants

Echinacea Rudbeckia Salvia Coreopsis Gaillardia

Multiply

Propagation Methods

Good to Know

Common Questions

Evening Primrose questions

What zones can Evening Primrose grow in?

Evening Primrose is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Evening Primrose deer resistant?

Yes — Evening Primrose is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Evening Primrose bloom?

Evening Primrose typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Evening Primrose need full sun?

Evening Primrose does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Evening Primrose drought tolerant?

Yes — once established (usually after the first full season), Evening Primrose handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.