Toxic Plant Inconnu - Inadequate information on toxicity found.
Image of Oenothera biennis
Source: Donna Bos
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Plant Names

image of Plante à fleurs
Oenothera biennis
Common Evening-primrose
Onagre bisannuelle

Synonyms

hoary evening-primrose
king's cureall
yellow evening-primrose
herbe aux ânes
onagre de Victorin

Plant Characteristics

Couleur de floraison: Jaune Bloom Period: Jun - Sep
Hauteur max: 6,0 feet
Max Width: 2,0 feet
Light Condition:
Full sun Plus de 6 heures d'ensoleillement par jour
Part shade More than 2 or 3 hours but less than 6 hours of direct sun a day
Soil conditions:
Moisture dry Tolère des conditions de sol sec
Moisture medium Tolerates medium soil condition
Lifespan: Bisannuel des plantes qui mettront deux ans à fleurir, puis mourront
Gardener Experience:
plant germinate easy Facile à germer
plant self seeding Self-seeding
Landscape Uses:
rock garden Suitable for rock gardens
shoreline_rehab Suitable for shoreline rehabilitation
container suitable Suitable for container garden
boulevard garden tolerant Tolerates boulevard garden conditions
Ecological Benefits:
Bird friendly Supports birds
butterfly host Butterfly host
bee host Bee host
keystones species Keystone species
Tolerates:
Salt Tolerant Tolerates salt conditions
Limestone Tolerant Tolerates limestone conditions
Juglone Tolerant Tolerates juglone conditions
Special Features and Considerations:

Seed and plant distribution status

No seeds available for this plant.
Nous acceptions les semences de cette plante

Faits intéressants

Common Evening Primrose's flowers open in the evening and close by noon. The plant takes 2 years to complete its life cycle, with leaves prominent the first year and yellow flowers appear during the second year. The roots are eaten by some wildlife. It does well in newly established landscapes and any seeds remaining on the ground will self germinate if the ground is disturbed.

Plant Location

Native to Ottawa region: Oui

Distribution according to VASCAN

Distribution: Oenothera biennis
Ephemeral Native Introduced Excluded Extirpated Doubtful Absent

Thrives in Ecozones

  • Taïga des plaines
  • Maritime de l'Atlantique
  • Taïga du Bouclier
  • Plaines boréales
  • Cordillière montagnarde
  • Prairies
  • Plaines hudsoniennes
  • Bouclier boréal
  • Cordillière boréale
  • Maritime du Pacifique
  • Plaines à forêts mixtes

Ecological Benefits

Butterflies Supported by Oenothera biennis

Specialized Bees Supported by Oenothera biennis

  • Lasioglossum oenotherae

Complementary Plants

  • No complementary plants found.

Substitute For Non-Native Plants

  • Oenothera (Non-Native Primrose)
  • Oenothera biennis (Evening Primrose Cultivars)

Sowing Information

Download Seed Envelope Labels (PDF)
  • Sowing depth: Surface sow
  • Sow anytime
  • Stratification duration: 0 days
  • Self-seeding
  • Notes: Can be sown in early spring in cool soil.

Harvesting and Seed Sharing

  • Harvest start month: September
  • Harvesting indicator:
    • Pods are brown, seeds are dark, and crisp, and little stem connecting the pod to the main stem is brown (not green)
  • Harvesting:
    • Cut stem (including pods), let air dry in paper bag, then shake seeds off after a few days
  • Seed viability test:
    • Pas de test requis avant le don
  • Packaging measure: 1 rounded 1/32 teaspoon
  • Seed storage:
    • Sécher à l'air dans un sac en papier ou contenant ouvert, pour quelques jours jusqu'à sec
    • Secouer de temps à autre pour prévenir la moisissure
  • Cultivar: Yes, do not donate unless you know source, and there are no known cultivars in your garden or at proximity
  • Remove non-seed material
  • Harvesting video: Watch here

Toxicity Notes

Inadequate information on toxicity found.