trouble with sweetgum pop-ups

David T
by David T
Last year we removed a 16-20" girth sweetgum tree, the stump was ground and the mulch saved. The roots 2 to 3 feet out keep sending up trees in various places. Can't seem to kill them for long with roundup. Also I used the chips after a year as mulch...guess what..sweetgum sprouts. HELP!!
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