Connu comme étant toxique - Toxic to mammals if ingested. Contains compounds that may cause photosensitivity if eaten in large quantities, especially by livestock.
Plant Names
Hypericum ascyron subsp. pyramidatum
American Great St. John’s-wort
Millepertuis pyramidal
Plant Characteristics
Couleur de floraison: Jaune
Bloom Period: Jul - Aug
Hauteur max: 6,0 feet
Max Width: 4,0 feet (spreads by rhizome)
Light Condition:
Plus de 6 heures d'ensoleillement par jour
More than 2 or 3 hours but less than 6 hours of direct sun a day
Soil conditions:
Tolerates medium soil condition
Plus de 6 heures d'ensoleillement par jour
More than 2 or 3 hours but less than 6 hours of direct sun a day
Tolerates medium soil condition
Lifespan:
Vivace
des plantes qui reviennent année après année
Gardener Experience:
Suitable for beginner gardeners
Ne se propage pas de manière incontrôlable
Spreads by rhizome
Facile à germer
Self-seeding
Suitable for beginner gardeners
Ne se propage pas de manière incontrôlable
Spreads by rhizome
Facile à germer
Self-seeding
Landscape Uses:
Suitable for rain gardens
Suitable for container garden
Suitable for school gardens
Suitable for rain gardens
Suitable for container garden
Suitable for school gardens
Ecological Benefits:
Supports birds
Supports birds
Tolerates:
Deer resistant
Rabbit resistant
Tolerates juglone conditions
Tolerates transplantation
Deer resistant
Rabbit resistant
Tolerates juglone conditions
Tolerates transplantation
Special Features and Considerations:
Seed and plant distribution status
No seeds available for this plant.
Nous acceptions les semences de cette plante
Faits intéressants
American Great St. John's wort has large yellow flowers and showy stamens. It thrives in moist meadows, woodland edges, and sunny borders. It is highly attractive to native bees, bumble bees, pollen-collecting insects, hoverflies, and beneficial wasps. Birds may feed on seeds. It has an upright clump-forming habit and does not spread aggressively.
Plant Location
Distribution according to VASCAN
Ephemeral
Native
Introduced
Excluded
Extirpated
Doubtful
Absent
Canadensis
Thrives in Ecozones
- Plaines boréales
- Plaines à forêts mixtes
Ecological Benefits
Butterflies Supported by Hypericum ascyron subsp. pyramidatum
No butterfly data available for this plant.
Specialized Bees Supported by Hypericum ascyron subsp. pyramidatum
No bee data available for this plant.
Complementary Plants
- No complementary plants found.
Substitute For Non-Native Plants
- Euonymus alatus (Burning Bush)
- Buxus sempervirens (Boxwood)
- Forsythieae (Forsythia)
- Berberis (Barberry)
Sowing Information
Download Seed Envelope Labels (PDF)
- Sowing depth: Surface sow
- Sow by February
- Stratification duration: 60 days
- Self-seeding
Harvesting and Seed Sharing
- Harvest start month: November
- 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: No, you can donate without knowing the source as there are only straight species
- Remove non-seed material
- Harvesting video: Watch here
Toxicity Notes
Toxic to mammals if ingested. Contains compounds that may cause photosensitivity if eaten in large quantities, especially by livestock.