Scientific Name:
Oenothera biennis
Pronunciation:
ee-no-THEE-ruh bye-EN-niss
Common Name:
evening primrose
Family Name:
Onagraceae
Plant Type:
Biennial, Invasive plant
Key ID Features:
Leaves in first year basal, lance-shaped, shallow-toothed; about 10-20cm long x 5cm wide; leaves in the second year spirally arranged on stem arising from the rosette; florets with four yellow petals, in terminal panicles, and open at dusk; capsules pod-like and contain >100 seeds.
Habit:
Upright
Form:
Oval - vertical
Texture:
Medium
Mature Height:
0.7 - 1.3m
Mature Spread:
0.6 - 1.0m
Growth Rate:
Fast
Origin:
Canada - eastern, U.S. - northeast
Hardiness Rating:
Zone 4: (-34 to -29 °C)
Exposure:
Full sun
Soil/Growing Medium:
Landscape Uses:
Wildlife food
Additional Info:
Leaf Morphology:
Form:
Simple
Arrangement:
Alternate, Basal
Texture/Venation:
Soft flexible, Pinnate venation
Surfaces:
Pubescent
Colour in Summer:
Green, Red
Shapes:
Lanceolate, Oblong
Apices:
Acute
Margins:
Dentate, Undulate (wavy)
Inflorescence Type:
Raceme, Floriferous
Flower Morphology:
Flowers perfect
Number Of Petals:
4
Corolla Shape:
Campanulate
Ovary Position:
Inferior
Colour (petals):
Yellow
Flower Scent:
Fragrant
Flower Time at Peak:
Jun, Jul, Aug, Sep
Fruit Type:
Capsule
Fruit Colour:
Brown
Fruiting Time:
Jun, Jul, Aug, Sep
Bark Morphology:
Smooth
Bark or Stem Colour:
Green, Red
Pest Susceptibility:
Fungal leaf spot, Mildew (Pest resistant, Disease resistant, Drought tolerant)
