S Tarry wrote:
Easiest way I have found of propagating comfrey is to tear off a leaf at the base of the stem and stick it in a pot with soil and keep it watered....a new root will grow out the bottom of the leaf stem after a few weeks. Eventually you will see new leaves growing out from the base of the stem and it will start to look like a regular comfrey plant. Saves the trouble of digging up comfrey roots.