The best way to control weeds in the garden is to prevent them from getting started in the first place. Preen garden weed preventer has a specialized formula to keep weed seeds from sprouting around trees and shrubs in landscapes. One easy application of Preen Garden Weed Preventer keeps over 200 broadleaf and grassy weeds from sprouting for up to three months. Your garden will stay weed-free all season long. Weeds rob desirable plants of water and other nutrients. Preen garden weed preventer stops weeds and eliminates time-consuming weed pulling chores. With Preen, you’ll be free to enjoy a beautiful, weed-free landscape.