We have a number of Southern Live-oaks on our campus and there are 3 that produce large numbers of sprouts from the roots. These are large trees (about 50 years old) in a row of 8. Do these ever stop producing suckers? Is there a cultural practice that encourages/discourages them from growing back? At this point we simply "mow" them with hedge trimmers, but if there is something we can do to stop them that would be great. Any and all suggestions are appreciated.