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Bransford, W.D. and Dolphia
Oenothera fruticosa ssp. glauca
Oenothera fruticosa L. ssp. glauca (Michx.) Straley
Narrowleaf evening-primrose, Sundrops
Onagraceae (Evening-Primrose Family)
Synonym(s): Kneiffia glauca, Kneiffia hybrida, Kneiffia latifolia, Kneiffia tetragona, Oenothera riparia, Oenothera tetragona, Oenothera tetragona ssp. glauca, Oenothera tetragona var. fraseri, Oenothera tetragona var. hybrida, Oenothera tetragona var. latifolia
USDA Symbol: OEFRG
USDA Native Status: L48 (N), CAN (N)
A longstanding garden favorite, this Oenothera lends vivid yellow color during late spring and early summer. Its dark green foliage provides a soothing backdrop to the flowers. It colonizes via stolons and runners but isnt terribly aggressive, remaining at a well-behaved 2 feet by 2 feet when planted. In the wild, it occurs naturally in woodland openings east of the Mississippi River in acidic, typically rocky, but rich soils.
Plant CharacteristicsDuration: Perennial Habit: Herb Size Notes:
Normally 1 to 2 feet tall, but can exceed 5 feet Leaf:
Dark green with reddish tinge in winter Flower:
Flowers 2 inches wide.
1/2 inch Size Class:
1-3 ft. , 3-6 ft.
Bloom InformationBloom Color: Yellow
Bloom Time: Apr , May , Jun
Bloom Notes: Flowers close at night.
, WV Native Distribution:
east of the Mississippi River, Zones 5 through 8 Native Habitat:
Sunny, rocky spots and open woodlands
Growing ConditionsWater Use: Low , Medium
Light Requirement: Sun , Part Shade
Soil Moisture: Dry , Moist
Soil pH: Acidic (pH<6.8)
CaCO3 Tolerance: Low
Drought Tolerance: Medium
Soil Description: Tolerates a wide range but likes high acidity, rich soils. Also grows in clay, sandy, and rocky soil.
Conditions Comments: Prefers good drainage and does not tolerate lime or brackish soils.
An old-fashioned garden favorite finding renewed favor as native
plants become popular. Conspicuous Flowers:
Hummingbirds Nectar Source:
PropagationPropagation Material: Root Division , Seeds
Commercially Avail: yes
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Delaware Nature Society
- Hockessin, DE
Record Last Modified: 2013-09-09
Research By: TWC Staff