For season-long protection, reapply every 9–12 weeks . Option 3: Quick Buyer's Guide Preen Garden Weed Preventer
You must remove existing weeds first; Preen only prevents new growth, it doesn't kill what's already there. buy preen
Sprinkle granules evenly around established plants (at least 2–3 inches tall) and water immediately to activate the barrier. For season-long protection, reapply every 9–12 weeks