- Desert Tropicals: Comfrey
- Contains information on the general characteristics of the plant. Includes growth habits, blooming habits and images.
- Florabase: Symphytum
- Contains information on the identity of the plant. Includes reproduction, Inflorescence and flower features, fruit and seed features.
- The Garden of Paghat the Ratgirl: Borage; aka, Tuberous Comfrey
- Contains information on the characteristics, growth and taxonomy. With photos.
- Missouri Botanical Garden: Symphytum 'Goldsmith'
- Provides information on the distinguishing properties of the plant. Includes culture, noteworthy characteristics, problems and uses.
- Montana Plant Life: Comfrey - Symphytum officinale L.
- Contains information on the distinguishing features of the genus. Includes history, flowers, uses and images.
- Plants For a Future: Symphytum officinale - L. Comfrey
- Contains information on the physical characteristics of the plant. Includes habitat, uses, cultivation and propagation.
- Purdue University: Symphytum peregrinum Ledeb.
- Offers information on the distinguishing characteristics of the plant. Includes botanical description, medicinal uses and chemical constituents.
- Stuartxchange: Komprey - Symphytum officinale
- Contains information on the botany, distribution, uses and availability. With photos.
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