I’m trying to kill a bunch of shrubs on the shore of a lake but I can’t use any chemicals–natural or otherwise. Pulling them out would be difficult because of the terrain. I’ve tried cutting them down, but they just sprout back from the stump.
So I’m looking for ways to encourage them to die. Would it work to cut the shrub down and then cover the stump area with a black landscape cloth, thus blocking any light from reaching it? Or perhaps scraping the bark off the branches to encourage infection? Or will the shrubs eventually die if I keep cutting it down?