16 results about "Comfrey" patented technology

Comfrey is a common name for plants in the genus Symphytum. Comfrey species are important herbs in organic gardening. It is used as a fertilizer and as an herbal medicine. The most commonly used species is Russian comfrey Symphytum × uplandicum, which is a cross or hybrid of Symphytum officinale and Symphytum asperum.