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Ageratina altissima (Snakeroot)
1 hour care
per year
per year
1.8m
Max height
Max height
0.6m
Max spread
Max spread
2-5 years
To maturity
To maturity
Plant details
Botanical name
Ageratina altissima
Other names
Snakeroot, White snakeroot , Boneset, Eupatorium rugosum, Eupatorium ageratoides, Eupatorium urticifolium, Eupatorium rugosa
Genus
Ageratina Ageratina
Species
A. altissima - A. altissima is a clump-forming, deciduous perennial with purple-brown stems bearing ovate to lance-shaped, toothed, grey-green leaves and corymbs of small, fluffy, white flowerheads from summer to early autumn.
Ageratina altissima is: Deciduous
Habit
Bushy, Erect
Flower
White in Summer; White in Autumn
Foliage
Grey-green, Flushed purple in Spring; Grey-green, Flushed purple in Summer; Grey-green, Flushed purple in Autumn
How to care
Watch out for
Pests
Resistant to damage by deer (Deer Resistant B - Seldom Severely Damaged).
Specific pests
Diseases
Generally disease-free.
General care
Pruning
Cut back spent flower stems to base.
Propagation methods
Division
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Where to grow
Ageratina altissima (Snakeroot) will reach a height of 1.8m and a spread of 0.6m after 2-5 years.
Suggested uses
Beds and borders, Cottage/Informal, Prairie planting, Wildlife
Cultivation
Plant in moist, alkaline soil in partial shade. Frost may damage new growth. Resistant to damage by deer.
Soil type
Chalky, Clay, Loamy
Soil drainage
Moist but well-drained, Moisture-retentive
Soil pH
Alkaline, Neutral
Light
Partial Shade
Aspect
East, West
Exposure
Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
Companion plants
Botanical name
Ageratina altissima
Other names
Snakeroot, White snakeroot , Boneset, Eupatorium rugosum, Eupatorium ageratoides, Eupatorium urticifolium, Eupatorium rugosa
Genus
Ageratina Ageratina
Species
A. altissima - A. altissima is a clump-forming, deciduous perennial with purple-brown stems bearing ovate to lance-shaped, toothed, grey-green leaves and corymbs of small, fluffy, white flowerheads from summer to early autumn.
Native to
Eastern North America
Foliage
Deciduous
Habit
Bushy, Erect
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Colour
Flower
White in Summer; White in Autumn
Foliage
Grey-green, Flushed purple in Spring; Grey-green, Flushed purple in Summer; Grey-green, Flushed purple in Autumn
How to care
Watch out for
Pests
Resistant to damage by deer (Deer Resistant B - Seldom Severely Damaged).
Specific pests
Diseases
Generally disease-free.
General care
Pruning
Cut back spent flower stems to base.
Propagation methods
Division
Monthly care advice
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Where to grow
Ageratina altissima (Snakeroot) will reach a height of 1.8m and a spread of 0.6m after 2-5 years.
Suggested uses
Beds and borders, Cottage/Informal, Prairie planting, Wildlife
Cultivation
Plant in moist, alkaline soil in partial shade. Frost may damage new growth. Resistant to damage by deer.
Soil type
Chalky, Clay, Loamy
Soil drainage
Moist but well-drained, Moisture-retentive
Soil pH
Alkaline, Neutral
Light
Partial Shade
Aspect
East, West
Exposure
Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
USDA zones
Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4
In order to add a note on this plant, please add this plant to your plant lists.
| This plant likes... | Garden match | |
| Soil types: | Chalky, Clay, Loamy | Tell us... |
| Soil drainage: | Moist but well-drained, Moisture-retentive | Tell us... |
| Soil pH: | Alkaline, Neutral | Tell us... |
| Light: | Partial Shade | Tell us... |
| Aspect: | East, West | Tell us... |
| Exposure: | Sheltered | Tell us... |
| Hardiness: | Hardy (H4) | Tell us... |
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