Preen Garden Weed Preventer Plus Plant FoodOne easy application of Preen Garden Weed Preventer Plus Plant Food prevents weeds for up to three months and feeds your plants to promote beautiful blooms and strong root growth. Apply Preen Garden Weed Preventer Plus Plant Food anytime in the spring, summer, or fall around established plants and transplants. By applying as early as possible, you can eliminate the need for hand weeding. It should not be used on flower seeds. It can be used after