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Comfrey is a shrub that grows in parts of Europe, Asia, and North America. It can grow up to 1m tall. It produces clusters of purple, blue, and white flowers, and it's famous for its long, slender leaves and black-skinned roots.
Comfrey has been cultivated as a green vegetable and has been used as an herbal medicine for more than 2,000 years. Comfrey's original name, knitbone, derives from the external use of poultices of its leaves and roots to heal burns, sprains, swelling, and bruises
In the garden it is used as a compost accerator with its high potassium content.
It goes dormant in the winter and is propagated by root cutting.