Time to vote for your favorites in the Pixel County Fair!. HERE is where you can vote!

Kneiffia Species, Meadow Evening-Primrose

Kneiffia pilosella

Family: Onagraceae (on-uh-GRAY-see-ee) (Info)
Genus: Kneiffia
Species: pilosella (pil-oh-SEL-uh) (Info)




Water Requirements:

Drought-tolerant; suitable for xeriscaping

Sun Exposure:

Full Sun

Sun to Partial Shade




Foliage Color:

Unknown - Tell us


under 6 in. (15 cm)

12-18 in. (30-45 cm)


6-9 in. (15-22 cm)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

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)

Where to Grow:

Unknown - Tell us


Unknown - Tell us

Bloom Color:

Bright Yellow

Bloom Characteristics:

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

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

By dividing the rootball

From seed; direct sow outdoors in fall

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds


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

Jeffersonville, Indiana

Louisville, Kentucky

Gardeners' Notes:


On Jan 12, 2015, sladeofsky from Louisville, KY (Zone 6b) wrote:

I think it's strange that there are so few comments on this plant and no photos. As a kid, virtually everyone I knew grew theses. It's among the easiest imaginable to grow. It does spread, so site it accordingly. These Sundroos are more of a pass along plant. If you don't have some, I highly suggest it. It is similiar to the more common Oenothera fruiticosa, but more refined, in my opinion. Perhaps it is upstaged by the latter, but for my money, this is the one to go for.


On Oct 20, 2006, Lady_fern from Jeffersonville, IN (Zone 6a) wrote:

These flowers are a BRILLIANT yellow in June. You can't miss them! When they are done blooming, they are easily cut back or even mowed to remove the seedheads. Then they form little basal rosettes of shiny foliage for the rest of the season. And even though it doesn't look they're doing anything, they are sending out underground stems about 8" in all directions that will sprout into new plants in the spring! So this little plant makes a great groundcover for your flowerbeds. But if it begins to overstep its bounds, it is easily dug up and moved at any time. It is also very easy from seed.