Russian comfrey is the most medicinal comfrey- Used to heal tissue quickly. Comfrey can be used for minor injuries of the skin, where it will work to increase cell production, causing wounds to heal over rapidly.
Comfrey is also demulcent, producing a mucilage that coats and soothes irritated tissues. It will help reduce inflammation, and at the same time lessen scarring.
Comfrey can also be given the livestock, chickens etc. as they will eat if they are not feeling well, helping them to internally heal.
*Some may disagree but not intended for human consumption.
One root cutting, will have full plant in 2 weeks if planted in spring or summer. Ships late spring, early summer.
Read more here http://www.modernroots.org/blog/dont-waste-that-comfrey