Photo by Melody

PlantFiles: Evening Primrose
Oenothera macrocarpa subsp. fremontii 'Shimmer'

Family: Onagraceae (on-uh-GRAY-see-ee) (Info)
Genus: Oenothera (ee-no-THEE-ruh) (Info)
Species: macrocarpa subsp. fremontii
Cultivar: Shimmer
Additional cultivar information: (PP19663)
Hybridized by Ogden; Year of Registration or Introduction: 2007

Synonym:Megapterium fremontii
Synonym:Oenothera fremontii

2 vendors have this plant for sale.

One member has or wants this plant for trade.


6-12 in. (15-30 cm)

12-15 in. (30-38 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
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

Seed is poisonous if ingested
Parts of plant are poisonous if ingested

Bloom Color:
Bright Yellow

Bloom Time:
Late Spring/Early Summer
Mid Summer


Other details:
Average Water Needs; Water regularly; do not overwater

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:
By dividing the rootball

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Click thumbnail
to view:

By peachespickett
Thumbnail #1 of Oenothera macrocarpa subsp. fremontii by peachespickett

By jenborcic
Thumbnail #2 of Oenothera macrocarpa subsp. fremontii by jenborcic

By dicentra63
Thumbnail #3 of Oenothera macrocarpa subsp. fremontii by dicentra63


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive DexGarden On Oct 6, 2012, DexGarden from Des Plaines, IL wrote:

I planted two primrose 'shimmer' this spring near Chicago. Despite their delicate appearance (and rather small shipping pot), they both bloomed profusely. In fact, they are both still blooming in the second week of October! Interesting grey/green foliage and delicate yellow blossoms, typically 1-1/2 inches across. I was pleasantly surprised, since this was listed as a 'water-wise' plant.

Positive jenborcic On Sep 2, 2010, jenborcic from Pittsburg, CA wrote:

I so love this flower - Flowers have been been blooming since the beginning of Summer into late summer. Love hot hot weather here in East California


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

Huntington, Arkansas
Pittsburg, California
Denver, Colorado
Des Plaines, Illinois
Henderson, Nevada
Hereford, Texas
Laramie, Wyoming

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