Hi-Yield Atrazine Weed Killer Atrazine - 4.00% Weeds Controlled or Suppressed: Annual Bluegrass (Poa annua), Chickweed (Commonand Mouseear), For use in St. Augustine and Centipede grass Henbit, Moneywort, Pennywort (Dollarweed), Chickweed (Common and Mouseear), Spurge, Annual