Toxic Plant Connu comme étant toxique - Fatal to mammals if ingested.
Image of Ageratina altissima
Source: Donna Bos
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Plant Names

image of Plante à fleurs
Ageratina altissima
White Snakeroot
Eupatoire rugueuse

Plant Characteristics

Couleur de floraison: Blanc Bloom Period: Jul - Oct
Hauteur max: 2,0 feet
Max Width: 2,0 feet (spreads by rhizome)
Light Condition:
Full shade Less than 2 or 3 hours of direct sun a day
Soil conditions:
Moisture medium Tolerates medium soil condition
Lifespan: Vivace des plantes qui reviennent année après année
Gardener Experience:
plant spread by rhizome Spreads by rhizome
plant self seeding Self-seeding
Landscape Uses:
rock garden Suitable for rock gardens
container suitable Suitable for container garden
woodland garden Suitable for woodland gardens
Ecological Benefits:
butterfly host Butterfly host
Tolerates:
Deer Resistant Deer resistant
Rabbit Resistant Rabbit resistant
Limestone Tolerant Tolerates limestone conditions
Juglone Tolerant Tolerates juglone conditions
Transplantation Tolerant Tolerates transplantation
Special Features and Considerations:
septic tank safe This plant is septic tank safe

Seed and plant distribution status

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

Faits intéressants

White Snakeroot is a good choice for a shady, woodland garden where its bright, pure-white heads of flowers can light up even the darkest corner. The plant spikes are upright and taller than they are wide. Blooming occurs in late summer and well into the fall season. It is adaptable to a broad range of conditions.

Plant Location

Native to Ottawa region: Oui

Distribution according to VASCAN

Distribution: Ageratina altissima
Ephemeral Native Introduced Excluded Extirpated Doubtful Absent

Thrives in Ecozones

  • Taïga des plaines
  • Plaines boréales
  • Plaines à forêts mixtes

Ecological Benefits

Butterflies Supported by Ageratina altissima

Specialized Bees Supported by Ageratina altissima

No bee data available for this plant.

Complementary Plants

  • No complementary plants found.

Substitute For Non-Native Plants

  • Sorbaria sorbifolia (False spirea)
  • Hydrangea (Hydrangea)
  • Aegopodium podagraria (Goutweed)

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: September
  • Harvesting indicator:
    • Seeds have become fluffy and can be easily removed by shaking on gently pulling off from stem
  • Harvesting:
    • Secouer le porte-graines dans un sac de papier
  • Seed viability test:
    • Pas de test requis avant le don
  • Packaging measure: 1 rounded 1/8 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
  • Harvesting video: Watch here

Toxicity Notes

Fatal to mammals if ingested.