Rick from Allen Park Michigan writes
Killzall Weed and Grass Killer - 41% Glyphosate kills only actively growing weeds and grasses and does not leave a residual in the soil. Therefore any seeds in the soil that have not germinated, would still be able to grow. To ensure there is no regermination or future growth, we would recommend removing the top layer of soil with a sod cutter or shovel if no regrowth is desired.
Answer last updated on: 06/25/2018