Ferti-Lome St. Augustine Weed and Feed 15-0-4 should be applied in early spring to prevent crabgrass, paspalum, spotted spurge, and sedge; and then again in the fall to avoid winter weeds like evening primrose, rabbit tobacco, henbit, and chickweed. Check the label for a number of other weeds that Ferti-Lome St. Augustine Weed and Feed 15-0-4 will control. Remember to water in Ferti-Lome St. Augustine Weed and Feed 15-0-4 after application. DO NOT apply to Northern grasses or Bermuda. Active Ingredient:Atrazine – 0.79% Total Nitrogen – 15% Soluble Potash – 4% Boron – 0.02%, Copper – 0.05%, Iron – 1%, Manganese – 0.05%, Zinc – 0.05%