Comfrey (Symphytum x uplandicum) is the comfrey we commonly have in New Zealand. It is a cross between wild comfrey S. officinale from Europe and S. asperum from Russia.
Also known as Knitbone, Boneset, Bruisewort, Slippery root and others it is a must have in the garden in my mind. It is a perennial plant that puts down very deep, thick roots used to bring up minerals from deep down and to break up compact soil. At this time in July the leaves are dying down for winter and they will rot and nourish the plants around where they grow. Comfrey is clump forming and doesn’t spread unless the roots are disturbed.
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