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Ageratina altissima (White Snakeroot)

White Snakeroot, Ageratum altissimum, Eupatorium ageratoides, Eupatorium rugosum, Eupatorium rugosum album, Eupatorium urticifolium

Ageratina altissima, White Snakeroot, Ageratum altissimum, Eupatorium ageratoides, Eupatorium rugosum, Eupatorium rugosum album, Eupatorium urticifolium
Ageratina altissima, White Snakeroot, Ageratum altissimum, Eupatorium ageratoides, Eupatorium rugosum, Eupatorium rugosum album, Eupatorium urticifolium

Ageratina altissima (White Snakeroot) is a clump-forming, spreading, herbaceous perennial boasting flat-topped clusters of small, fluffy, bright white flowers in summer and fall. Borne atop erect, strong branching stems, the long-lasting blossoms are attractive to bees, butterflies and moths in search of nectar. Long-stalked, sharp-toothed, gray-green, nettle like leaves, 3-6 in. long (7-15 cm), are paired along the stems. Native to North America, White Snakeroot provides a wonderful garden presence and late season flowers at a time when choices may be limited. Use it in the informal setting of a cottage garden or allow it to naturalize in a woodland garden.

  • Grows up to 3-5 ft. tall (90-150 cm) and 2-4 ft. wide (60-120 cm). Will spread by rhizomes and self-seeding where happy.
  • Performs best in part shade in humus-rich, moist, alkaline soils.
  • Very useful and adaptable in the garden, this is an excellent choice as an accent plant, or for mixed borders, cottage gardens, woodland gardens, wild gardens and naturalized areas.
  • No serious insect or disease problems. Deer resistant.
  • Cut back faded flower stems to base to avoid any unwanted self-seeding.
  • Propagate by seed or division, in spring.
  • White Snakeroot causes the trembles in cattle and milk sickness in humans.
  • Native to North America.

Requirements

Hardiness 3 - 8
Heat Zones 2 - 8
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 14, 15, 16, 17
Plant Type Perennials
Plant Family Compositae
Genus Eupatorium
Common names White Snakeroot
Exposure Partial Sun
Season of Interest Summer (Mid, Late)
Fall
Height 3' - 5'
(90cm - 150cm)
Spread 2' - 4'
(60cm - 120cm)
Spacing 48" (120cm)
Maintenance Low
Water Needs Low, Average
Soil Type Chalk, Clay, Loam
Soil pH Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Poorly Drained
Characteristics Showy
Native Plants United States, New Jersey, New Hampshire, New York, Vermont, Pennsylvania, Rhode Island, Maryland, Delaware, Connecticut, Massachusetts, Maine, Southwest, Southeast, Northeast, Midwest, Ohio, South Dakota, North Dakota, Illinois, Indiana, Minnesota, Kansas, Iowa, Nebraska, Wisconsin, Missouri, Michigan, South Carolina, North Carolina, Tennessee, West Virginia, Virginia, Florida, Arkansas, Alabama, Georgia, Mississippi, Louisiana, Kentucky, Texas, Oklahoma
Tolerance Deer
Attracts Bees, Butterflies
Garden Uses Beds And Borders
Garden Styles Informal and Cottage, Prairie and Meadow
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Do I Need?
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Eupatorium (Joe-Pye Weed)
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Alternative Plants to Consider

Eupatorium serotinum (Late Boneset)
Eupatorium capillifolium (Dog Fennel)
Eupatorium altissimum (Tall Boneset)
Eutrochium dubium (Coastal Plain Joe Pye Weed)
Eutrochium dubium ‘Baby Joe’ (Coastal Plain Joe Pye Weed)
Eupatorium perfoliatum (Common Boneset)

Recommended Companion Plants

Geranium Rozanne (Cranesbill)
Miscanthus sinensis ‘Morning Light’ (Chinese Silver Grass)
Crocosmia ‘Lucifer’ (Montbretia)
Hakonechloa macra ‘Aureola’ (Hakone Grass)
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 3 - 8
Heat Zones 2 - 8
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 14, 15, 16, 17
Plant Type Perennials
Plant Family Compositae
Genus Eupatorium
Common names White Snakeroot
Exposure Partial Sun
Season of Interest Summer (Mid, Late)
Fall
Height 3' - 5'
(90cm - 150cm)
Spread 2' - 4'
(60cm - 120cm)
Spacing 48" (120cm)
Maintenance Low
Water Needs Low, Average
Soil Type Chalk, Clay, Loam
Soil pH Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Poorly Drained
Characteristics Showy
Native Plants United States, New Jersey, New Hampshire, New York, Vermont, Pennsylvania, Rhode Island, Maryland, Delaware, Connecticut, Massachusetts, Maine, Southwest, Southeast, Northeast, Midwest, Ohio, South Dakota, North Dakota, Illinois, Indiana, Minnesota, Kansas, Iowa, Nebraska, Wisconsin, Missouri, Michigan, South Carolina, North Carolina, Tennessee, West Virginia, Virginia, Florida, Arkansas, Alabama, Georgia, Mississippi, Louisiana, Kentucky, Texas, Oklahoma
Tolerance Deer
Attracts Bees, Butterflies
Garden Uses Beds And Borders
Garden Styles Informal and Cottage, Prairie and Meadow
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Eupatorium (Joe-Pye Weed)
Not sure which Eupatorium (Joe-Pye Weed) to pick?
Compare Now

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