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Family: boraginaceae
Common name(s): comfrey
Hardiness ratings: USDA zone 3~5 - 8~9 
General resources
- Wikipedia. Online encyclopedia entry (if defined).
- Google images. Web search for photographs.
- GRIN. Taxonomical details, with common names, distribution, and synonyms.
- The Plant List. Taxonomical lookup
Links for Symphytum officinale
- All Things Plants - Community-assembled plant profile
 (29 photos)
- Asianflora - Plant photos. (2 photos)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 4-9) (27 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (zone 5) (1 photo)
- Floridata - Illustrated informative profile page with notes on culture, usage, and noteworthy features. (zone 3-9) (2 photos)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations. (3 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 4-8) (6 photos)
- Ontario Rock Garden Society - Germination information
- Pacific Bulb Society - One of the plants described on this page about the genus. (3 photos)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. (zone 4-9) (2 photos)
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