USA. Comfrey (Symphytum officinale) Leaf, Cut and Sifted, Certified Organic Common names: Boneset, Ass Ear, Blackwort, Borraja, Bourrache, Bruisewort, Buyuk Karakafesotu, Consolida, Consound, Consuelda, Gewone Smeerworte, Gum Plant, Healing Herb, Hirehari-So, Knitback, Knitbone, Liane Chique, Slippery Root, Yalluc Family: Boraginaceae Comfrey is a hardy perennial plant reaching 1-3 feet in height. Native to watery areas of Europe, Great Britain, and parts of Western and Central Asia, and widely naturalized elsewhere, it is greatly valued in agriculture as a source of concentrated nutrients for animal feed and in organic fertilizers. Comfrey is best known for its component allantoin, a small hormone-like molecule that is used in many topical products to stimulate cell growth and tissue repair for broken bones as well as many other conditions including wounds, sprains, ulcers, burns, arthritis and back pain, rashes, bleeding hemorrhoids, and herpes lesions.