Author 'Francine.' (Id 79307 ) : This is a great plant comfrey; Indians once used, its root in poultice primed to repair broken bones in humans, during accidents. And it worked because it gave the name of comfrey (welding)! This plant is very invasive! A tiny piece of root in the soil, give a lot of these shrubs, which bloom in the form of purple bells, whose seeds mature they also contribute to the spread: 4: