Oenothera Species, Evening Primrose, Dandelion-Leaved Sundrop

Oenotheraacaulis

Family
Onagraceae (on-uh-GRAY-see-ee)
Genus
Oenothera (ee-no-THEE-ruh)
Species
acaulis (a-KAW-liss)
Synonym
Sun Exposure
Sun to Partial Shade
Foliage
Herbaceous
Smooth
Height
6-12 in. (15-30 cm)
Spacing
6-9 in. (15-22 cm)
Hardiness
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)
Bloom Color
Pale Yellow
Bloom Time
Mid Summer
Late Summer/Early Fall
Blooms repeatedly
Other Details
Category
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
Patent Information
Propagation Methods
From seed; direct sow outdoors in fall
Seed Collecting
Allow pods to dry on plant; break open to collect seeds
Regional

This plant is said to grow outdoors in the following regions:

Riverside, California

Chicago, Illinois

Patriot, Indiana

Lincoln Park, Michigan

Akron, New York

Buffalo, New York

Penn Yan, New York

Rochester, New York

Watertown, New York

Cleveland, Ohio

Tulsa, Oklahoma

Philadelphia, Pennsylvania

Trafford, Pennsylvania

Austin, Texas

Sterling, Virginia

Lake Mills, Wisconsin

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Gardener's Notes:

8
positives
0
neutral
0
negative
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M
M
Indian Trail, NC | May 2021 | positive

Would love to find a source for plants or seeds for this awesome but hart to find plant...anyone?

J
| August 2011 | positive

We are in Markham, Ontario, Canada. We have a few of these plants and only now have discovered it's actual name. Thanks for including nin...Read More

R
R
Murrysville, PA | August 2004 | positive

Watching these bloom at about 9 pm is like watching time lapse photography. They attract hummingbird moths in the evening. DO NOT mulch...Read More

C
C
cdb
Lake Mills, WI | July 2004 | positive

This plant has been the cause of many evening gatherings in our garden. Bloom time is quite dramatic and we've even been known to cheer ...Read More

S
| June 2004 | positive

To cllect seed from this plant -
In september/October after blooming is finished, look under the leaves at the base of the plant a...Read More

A
A
Riverside, CA | June 2004 | positive

This is my second yr. of the beautiful evening primrose. Here in Ca., it opens up around 5p.m., and mine are in partial shade, so they r...Read More

J
Spencer, WV | April 2004 | positive

The Evening Primrose, also called Nine-O-Clock in West Virginia, is an intriguing plant. The opening of the flowers at precisely nine p....Read More

V
Tulsa, OK | November 2003 | positive

This plant is easy to grow, attractive, and makes lots of beautiful, sweet smelling flowers. I thoroughly enjoy this plant!

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