Preen Garden Weed Preventer stops weeds from germinating in flower and vegetable gardens, ground covers, and trees and shrubs. Preen will not kill existing weeds. It will prevent new weeds from sprouting—eliminating the need for complicated and time-consuming hand weeding. Without weeds, your valuable plants can grow larger and more robust. How to Apply Preen Garden Weed Preventer When plants are dry, sprinkle this product on the soil surface following package instructions. Once activated by watering, it forms a weed control barrier in the top layer of soil (1 – 2 inches), preventing weed seeds from germinating. Disturbance to the soil surface after activation may result in erratic weed control. When to Apply Preen Garden Weed Preventer Apply Preen Garden Weed Preventer around established plants and transplants during the growing season. Preen should not be used on flower seeds. It can be used after flowering plants have germinated and are 2 – 3 inches tall. Preen may be incorporated into the soil when seeding vegetables or applied after mulching beds. Applying Preen as early as possible can eliminate the need for hand weeding. Rain does not wash this product out of the soil. To keep beds weed-free all season long, reapply the Preen weed preventer every 9 – 12 weeks. Applying Preen Garden Weed Preventer Around Established and Transplanted Plants For flowers, roses, herbs, ground covers, ornamental grasses, shrubs, trees, and listed vegetables at least 2 – 3 inches tall, sprinkle Preen Garden Weed Preventer evenly over the entire soil surface at the rate of 1 oz per 10 sq ft, being sure to keep granules away from plant roots and foliage. Immediately water. If watering-in is not convenient, lightly rake into the soil surface. Always wash or brush off stray weed-preventer granules from plant foliage to avoid damage or discoloration. Applying Preen Garden Weed Preventer with Mulch For best weed control, we recommend applying Preen Garden Weed Preventer after spreading mulch on your flower and shrub beds. Sprinkle Preen on top of the mulch, keeping granules away from plant foliage. Immediately water this product into the mulch. If watering in is not convenient, lightly rake into the top layer of mulch. Always wash or brush off stray granules from plant foliage to avoid damage or discoloration.
