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Herbaceous Perennial
Ageratina altissima
white snakeroot
A tall herbaceous perennial to about 1.7m with brown stems and grey-green, nettle like leaves. Umbel-like clusters of small, white, long-lived flowers appear in summer and early autumn
Other common names
deerworthardy age
see moremilk ipecac
mist flower
nettle-leaved hemp agrimony
rich weed
white sanicle
Synonyms
Eupatorium urticifoliumEupatorium ageratoides
see moreEupatorium rugosum
Eupatorium album misapplied
Eupatorium fraseri misapplied
Eupatorium rugosum album
Ageratum altissimum
Size
Ultimate height
1.5–2.5 metresTime to ultimate height
2–5 yearsUltimate spread
0.5–1 metresGrowing conditions
Chalk
Clay
Loam
Moisture
Moist but well–drained, Poorly–drainedpH
Alkaline, NeutralColour & scent
Stem | Flower | Foliage | Fruit | |
Spring | Green Grey Silver | |||
---|---|---|---|---|
Summer | White | Green Grey Silver | ||
Autumn | White | Green Grey Silver | ||
Winter |
Position
- Partial shade
Aspect
East–facing or West–facing
Exposure
Sheltered Hardiness
H5Botanical details
- Family
- Asteraceae
- Native to the UK
- No
- Foliage
- Deciduous
- Habit
- Bushy
- Genus
Ageratina are shrubs or herbaceous perennials with opposite leaves and small tubular flowers borne in corymbs
- Name status
Correct
- Plant range
- North America
How to grow
Cultivation
The ideal site is a moist, alkaline soil in partial shade; frost may damage new shoots
Propagation
Propagate by seed or division, in spring
Suggested planting locations and garden types
- Wildlife gardens
- Cottage and informal garden
- Flower borders and beds
Pruning
Cut back faded flower stems to base
Pests
Diseases
Generally disease-free
Get involved
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