Controlling weeds in a decomposed granite labyrinth.
Controlling weeds in a decomposed granite labyrinth. #314080 . Asked April 17, 2016, 4:58 PM EDT. This Labyrinth is about 50 feet in diameter at a church. We had been controlling weeds with Roundup, a lot of Roundup, but this is awful stuff to use in an area where children play. Hand weeding worked until a whole bunch of small grass emerged ...