Photo by Melody

PlantFiles: Sundrops
Oenothera perennis

Family: Onagraceae (on-uh-GRAY-see-ee) (Info)
Genus: Oenothera (ee-no-THEE-ruh) (Info)
Species: perennis (per-EN-is) (Info)

Synonym:Kneiffia perennis

2 members have or want this plant for trade.

View this plant in a garden


6-12 in. (15-30 cm)
12-18 in. (30-45 cm)

15-18 in. (38-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 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)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:
Bright Yellow

Bloom Time:
Mid Summer


Other details:
Unknown - Tell us

Soil pH requirements:
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By daryl
Thumbnail #1 of Oenothera perennis by daryl

By Todd_Boland
Thumbnail #2 of Oenothera perennis by Todd_Boland


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive BdnGardener On Jul 15, 2011, BdnGardener from Brandon
Canada wrote:

I have successfully grown this plant for 4 years and am in a zone 3a. Beautiful and an easy keeper. Receives good snow cover and protection from winter wind. Grown in full sun.

Positive daryl On Jul 1, 2007, daryl from vernon, BC (Zone 6a) wrote:

A native wildflower to much of Eastern North America,this is an easy-to-grow plant for the sunny rock garden or border.It forms an low to medium -tall clump of narrow green leaves,the branching stems bearing small golden-yellow flowers for weeks on ed,which open during the day and close up at night.Sometimes acts as a self seeding biennial.Tolerates dry or moist sites.
Aka: "small sundrops"


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

Ocala, Florida
Waleska, Georgia
Quincy, Michigan
Youngstown, Ohio
Charlestown, Rhode Island

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