Oenothera Species, Evening Primrose, Missouri Primrose, Bigfruit Evening Primrose, Ozark Sundrops

Oenothera macrocarpa

Family: Onagraceae (on-uh-GRAY-see-ee) (Info)
Genus: Oenothera (ee-no-THEE-ruh) (Info)
Species: macrocarpa (ma-kro-KAR-pa) (Info)


Alpines and Rock Gardens



Foliage Color:


Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round


6-12 in. (15-30 cm)

12-18 in. (30-45 cm)


15-18 in. (38-45 cm)

18-24 in. (45-60 cm)


USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:

Full Sun

Sun to Partial Shade


Unknown - Tell us

Bloom Color:

Bright Yellow

Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall


Unknown - Tell us

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:


Citrus Heights, California

Richmond, California

Englewood, Colorado

Wilmington, Delaware

Divernon, Illinois

Oak Lawn, Illinois

Waukegan, Illinois

Owensboro, Kentucky

Tyngsboro, Massachusetts

Turner, Michigan

Belton, Missouri

Cole Camp, Missouri

Elsberry, Missouri

Piedmont, Missouri

Saint Louis, Missouri

Juniata, Nebraska

Henderson, Nevada

Fredericton, New Brunswick

Dunkirk, New York

Winston Salem, North Carolina

Madison, Ohio

Wynnewood, Pennsylvania

Abilene, Texas

Austin, Texas

Mc Kinney, Texas

Leesburg, Virginia

Appleton, Wisconsin

Owen, Wisconsin

show all

Gardeners' Notes:


On Jan 17, 2005, JodyC from Palmyra, IL (Zone 5b) wrote:

In Illinois, Missouri Evening Primrose has been observed in natural habitat in only St. Clair county, where it may be extirpated. Habitats include hill prairies and limestone glades. Outside of the state, this plant is also observed in dry prairies and barrens with sparse vegetation; these habitats often have gravelly or sandy soil. Missouri Evening Primrose is often grown in flower gardens.

Missouri Evening Primrose has striking flowers that are quite large for the size of the plant. It can be confused with no other plant that occurs (or used to occur) in the natural habitats of Illinois.


On Oct 11, 2004, tcfromky from Mercer, PA (Zone 5a) wrote:

This is a very attractive and showy flower making it a nice addition to a wildflower garden. Well suited for a rock garden. There are 4 distinct subspecies of Evening primrose, all are commonly called Missouri evening primrose, however each has their own subtle differences in identification, adaptation and geographic distribution.


On Jul 27, 2004, Haas from Appleton, WI wrote:

This is a beautiful no maintenance well groomed plant. Their huge flowers offer a large splash of color and and certainly add to the "curb appeal" to our home.

They tolorate our northeast Wisconsin winters well - coming back each year a bit fuller than the year before. After five years the round low mound of flowers are about 2 1/2 feet across and are always in bloom from late spring through mid fall. It's not unusual for each plant to sport 10 to 12 spectacular flowers at any given time.

NOTE: None of ours are planted in full sun and all are doing very well.