Hi-Yield Treflan Herbicide Granules Is A PreEmergent Herbicide To Stop The Growth Of Weeds And Grasses In Flower Gardens, Vegetable Gardens And Around Trees And Shrubs. Eliminates back breaking hand weeding or the need to apply post emergent chemicals that are a risk to your desirable plantings. First till your garden. Then apply Treflan early in the growing season. That's early April here in the Quad Cities. Then mix Treflan into the top 1" to 3" of soil. Then seat your transplants. A few vegetables can be grown from seed in Treflan, but most plantings need to be bedding plants. Make a second application in Mid-June. Do not use on ground covers. Keep children and pets off of treated areas until Treflan has been worked into the soil. This is an effective and more ecconomical brand than the leading national grass and weed preventer with the same active ingredient. 4 Lbs.