perennial RHS AwardN. America Native

Missouri Evening Primrose Giant Evening Primrose

Oenothera macrocarpa

Not currently listed at our partner nurseries.

Expertly Curated

Real-Time Pricing

Loved by Designers

Essentials

At a Glance

Plant Type

Perennial

Height

24 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8

Water

Low to moderate

Humidity

Average

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Oenothera macrocarpa, commonly known as the Ozark evening primrose, is a perennial wildflower characterized by its large, bright yellow flowers and adaptability to various soil types. Notable for its long-blooming period and ability to thrive in dry conditions.

Bloom Period:

EarlyLate

Uses & Benefits:

Oenothera macrocarpa offers bright yellow blooms that attract pollinators, adding color and ecological value to sunny gardens.

Its drought tolerance reduces water needs, making it ideal for xeriscaping.

Provides nectar for bees and butterflies, supporting local pollinator populations.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

Shipping costs Year-round shipping Free shipping

Planting

How to Grow

Select well-draining soil with sandy or loamy texture.
Tuck seeds just below soil surface in early spring or fall.
Mist cuttings or seedlings regularly to maintain moisture.
Thin seedlings to prevent overcrowding, spacing 12 inches apart.
Mulch around plants to retain moisture and suppress weeds.
Transplant young plants after they establish roots, typically in spring.

Pro Tip

Plant in full sun for best flowering and drought tolerance.

Keep It Thriving

Care Guide

Do

Water deeply during dry spells 🌱
Deadhead spent flowers to encourage more blooms
Apply a balanced fertilizer in spring

Don't

Avoid overwatering to prevent root rot ❌
Don’t disturb roots during flowering
Refrain from using heavy, clay-rich soil

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Sunny wildflower meadowDrought-tolerant borderSilvery foliage accent

Companion Plants

Lavender Salvia Blanket Flower Yarrow

Multiply

Propagation Methods

Good to Know

Common Questions

Missouri Evening Primrose Giant Evening Primrose questions

What zones can Missouri Evening Primrose Giant Evening Primrose grow in?

Missouri Evening Primrose Giant Evening Primrose is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Missouri Evening Primrose Giant Evening Primrose deer resistant?

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

When does Missouri Evening Primrose Giant Evening Primrose bloom?

Missouri Evening Primrose Giant 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 Missouri Evening Primrose Giant Evening Primrose need full sun?

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

Is Missouri Evening Primrose Giant Evening Primrose drought tolerant?

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