Photo by Melody

PlantFiles: Shrubby Sundrops, Narrow-leaf Evening Primrose
Kneiffia fruticosa 'Youngii'

Family: Onagraceae (on-uh-GRAY-see-ee) (Info)
Genus: Kneiffia
Species: fruticosa (froo-tih-KOH-suh) (Info)
Cultivar: Youngii

Synonym:Oenothera fruticosa

3 members have or want this plant for trade.


18-24 in. (45-60 cm)

12-15 in. (30-38 cm)
15-18 in. (38-45 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

Unknown - Tell us

Bloom Color:
Bright Yellow

Bloom Time:
Mid Summer


Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By Gabrielle
Thumbnail #1 of Kneiffia fruticosa by Gabrielle

By Gabrielle
Thumbnail #2 of Kneiffia fruticosa by Gabrielle


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive mygardenefforts On Feb 13, 2008, mygardenefforts from Syracuse, NY wrote:

This plant is wonderful for sharing. Not too evasive here in central New York. Can be tamed with just a shovel and transplants beautifully. Very cheerful in the bed.

Positive jacobhugh On Oct 29, 2006, jacobhugh from Eugene, OR wrote:

Fantastic, long-lasting flower. Plants make a dense mat which can be transplanted by the shovelful. Loves the sun and doesn't need much water here in the Pacific Northwest. A very rewarding plant in the garden.


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

Waleska, Georgia
Solsberry, Indiana
Quincy, Massachusetts
East Tawas, Michigan
Omaha, Nebraska
Syracuse, New York
Lewis Center, Ohio
Eugene, Oregon

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