Daniel Hall wrote:Comfrey is always devoured by deer on my property. It is hard to believe that it could be so desireable to wild animals yet poisonous to others as animals have insticts about what is edible. Both comfrey and yarrow are great bioactivators for compost but they must be dried first as comfrey easily roots from the stem and is nearly impossible to eradicate once established as it has a large deep tap root. Yarrow runs underground like wildfire so make sure they can't invade other areas. I plant them in the mulch beneath my fruit trees and chop or pull and toss on top to dry. This is my preference and I don't expect everyone to want to use the same method with these persistent plants.