Toxic Plant Known to be toxic - Fatal to mammals if ingested.
Image of Ageratina altissima
Source: Donna Bos
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image of Flowering plant
Ageratina altissima
White Snakeroot
Eupatoire rugueuse
No seeds available for this plant.

We are not accepting seeds for this plant at the moment.

Bloom Colour: White Bloom Period: Jul - Oct
Max Height: 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: Perennial plants that will that come back year after year
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

Plant Location

Native to Ottawa region: Yes

Distribution according to VASCAN

Distribution: Ageratina altissima
Ephemeral Native Introduced Excluded Extirpated Doubtful Absent

Thrives in Ecozones

  • Taiga Plains
  • Boreal Plains
  • Mixed Wood Plains

Ecological Benefits

Butterflies Supported by Ageratina altissima

No butterfly data available for this plant.

Specialized Bees Supported by Ageratina altissima

No bee data available for this plant.

Plants that grow in similar conditions, that bloom at the same time.

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:
    • Shake seed head in paper bag
  • Seed viability test:
    • No test needed before donating
  • Packaging measure: 1 rounded 1/8 teaspoon
  • Seed storage:
    • Air dry in paper bag or open container, for a few days until crisp
    • Shake seeds to move them once in a while to prevent molding
  • 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.