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Family: boraginaceae
Common name(s): Persian comfrey
Hardiness ratings: USDA zone 4~5b - 8 
General resources
Links for Symphytum asperum
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 5b)
 (1 photo)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (zone 4)
- Garden.org - Community-assembled plant profile (1 photo)
- 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)
- Pacific Bulb Society - One of the plants described on this page about the genus.
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