Preen 5.625 lb. Garden Weed Preventer + Plant Food. It covers 900 sq. ft. and prevents weeds and feeds plants in one easy step. It can be used anytime during the spring, summer or fall in flower and ornamental garden beds, around ground covers, trees and shrubs. The balanced fertilizer promotes abundant blooms, increased yields and strong root development. It is safe for use around over 200 established flowers, vegetables, trees and shrubs. One application feeds your plants and prevents weeds for up to three months.