Just finished clearing 8 acres over the last six months. Was covered with hackberry trees about 3-4 inch diameter, LOTS of them. Now they are sprouting back up all over the place. If I keep mowing the new growth down will it eventually quit or do I need to treat the stumps somehow to kill them? Bulldozing the property was not an option since we wanted to leave a couple hundred of the larger trees for shade until we fugure out what to do. At my age I'll probably not live long enough to grow any new big trees for shade. Thanks for the help.