Preen Extended Control Weed Preventer Extended Control weed preventer. Labeled for use around 600 plants in perennial flower beds, around ground covers, trees, shrubs, in xeriscape settings, and rock gardens. Works on dandelions, crabgrass, field bindweed, white clover, chickweed, henbit, and more. One application blocks listed weeds from growing for up to 6 months. Does not kill existing weeds, prevents new weeds from growing. Do not use on flower seeds, lawns, vegetable gardens, or water gardens. Apply anytime during the growing season. Size 4.93 Lb., Concentrate or Ready To Use Ready To Use, Product Form Granules, Application Type Shaker, Safe For Edibles No, Safe For Pets No, Coverage Area 805 Sq. Ft., Contains Glyphosate No, Pkg Qty 1, Package Type Bottle