Is sterile comfrey a risk plant?
Over the years, I have talked warmly about the sterile comfrey's many benefits. It is enormously vigorous and seems to have the ability to kick-start the dynamics of farming systems through its nutrient-accumulating ability. It is a favorite among bumblebees, can keep weeds in check and at the same time cannot spread by seeds. Recently, however, some question marks have started to appear about comfrey.