Comfrey is a perennial herb native to Europe. The typical 2-3 feet tall plants produce blue, pink, purple, or white bell-shaped flowers and large leaves throughout the summer, with the first flowers opening in late April or early May. Comfrey should not be used internally. However, comfrey is a source of Allantoin which is often found as an ingredient in skin care preparations. Comfrey is also known by the names blackwort, slippery-root, bruisewort, boneset, knitbone, asses-ears
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