I have purchased several acres in the Piedmont of NC and am trying to figure out how to convert the land to a food forest. About 3 acres was pasture 10-12 years ago but is now overgrown mostly with blackberries and other nuisance plants. It does have a few edibles like persimmon and pecan. I plan to leave those in place but am trying to figure the best way to clear the other stuff. My plan is to get goats (I plan to have them anyway) and let them do most of the work. My question is how do I keep the stuff from coming back? Can I seed heavy with vetch, clover, alfalfa...? Ideas? Most everything is goat friendly but I know poison ivy and blackberries can be really hard to kill at the root. Thanks in advance.