Oenothera Species, Largeflower Evening Primrose, Showy Evening Primrose
Oenotheragrandis

Synonym:Oenothera laciniata var. grandiflora

Synonym:Oenothera laciniata var. grandis

Synonym:Raimannia grandis

Category
Annuals
Biennials

Water Requirements
Average Water Needs; Water regularly; do not overwater

Sun Exposure
Full Sun
Sun to Partial Shade

Foliage

Foliage Color

Height
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)

Spacing
3-6 in. (7-15 cm)
6-9 in. (15-22 cm)

Hardiness
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)

Where to Grow

Danger
N/A

Bloom Color
Pale Yellow

Bloom Characteristics

Bloom Size

Bloom Time
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Other details

Soil pH requirements

Patent Information
Non-patented

Propagation Methods
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
From seed; direct sow after last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting
Bag seedheads to capture ripening seed
Properly cleaned, seed can be successfully stored