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Family: asteraceae
Common name(s): White Snakeroot
Synonym(s): Eupatorium rugosum
Hardiness ratings: USDA zone 3~5 - 8~9 
General resources
Links for Ageratina altissima
- BBC Gardening: Eupatorium rugosum 'Chocolate' - Plant profile with horticultural details and garden uses.
 (1 photo)
- Connecticut Botanical Society - Wildflower profile. (3 photos)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 4-8) (5 photos)
- Denver Botanic Gardens: Ageratina altissima 'Chocolate' - Description, native range, and cultural requirements. (zone 4) (6 photos)
- Digging Dog Nursery: Eupatorium rugosum 'Chocolate' - Catalog page with descriptive information (zone 4)
- Garden.org - Community-assembled plant profile (2 varieties in database) (8 photos)
- Heritage Perennials: Eupatorium rugosum ‘Chocolate’ - Profile with description and horticultural details. (zone 5-9) (1 photo)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations. (5 photos)
- Kansas Wildflowers & Grasses - Plant portrait with botanical details and description (8 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (7 photos)
- Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 3-8) (8 photos). Also a page for 'Chocolate'.
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (9 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 3-9a) (5 photos)
- Ontario Rock Garden Society - Germination information. Also a page for another instance.
- Plant Delights Nursery - Catalog page with photo, horticultural basics, and descriptive blurb. (additional pages for other varieties) (1 photo)
- Rob's Plants: Eupatorium rugosum 'Chocolate' - Plant profile with basic horticultural information and often personal observations. (zone 4-8) (2 photos)
Links
Links
Links
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