Photo of Ageratina altissima

Ageratina altissima

White Snakeroot

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Clusters of white flowers bloom in late summer through fall, attracting bees and butterflies.

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Clusters of white flowers bloom in late summer through fall, attracting bees and butterflies. Dark green heart-shaped leaves grow on long stems leading up to the flower umbels. Snakeroot prefers part shade but will also tolerate heavy shade, as well as sun. It grows best in moist, humus-rich soils, but does well in dry soils. In the wild, Snakeroot occurs in woodlands, woodland edges and rocky areas. It can spread aggressively through underground rhizomes and self-seeding. White Snakeroot contains the toxin tremetol, which is toxic if ingested, making this plant deer resistant. Add it too your native woodland or along shady borders mixed within your other fall blooming perennials.

Wildlife Value: Snakeroot is one of our latest blooming natives, offering much needed nectar to bees, butterflies and moths preparing to overwinter or migrate. The leaves are food for several butterfly and moth caterpillars.

Plant Details:

Other Scientific Names: Eupatorium rugosum

Plant Type: Flower, Perennial

New Jersey Native: Yes

Bloom Times: Late Summer to Fall

Bloom Colors: White

Deer Resistance: High

Attracts Pollinators and Wildlife: Bees and Other Pollinators, Butterflies

Salt Tolerance: Unknown

Hardiness Zone: 6a, 6b, 7a, 7b

Physiographic Region: All Regions in NJ

Soil Characteristics

Soil Type: Loam, Organic, Sandy

Soil Moisture: Dry, Moist, Wet

Soil pH: Slightly Acidic, Neutral, Slightly Alkaline

Light Needs of Plant

Optimal Light: Partial Shade

Light Range: Partial Shade, Shade

Water Needs of Plant

Soil Moisture: Dry, Moist, Wet

Drought Tolerance: Medium

Size and Growth Rate

Height: 3 - 5 ft

Spread: 2 - 4 ft

Growth Rate: Medium-fast