Preen Americas Best Flower and Garden Weed Preventer Nothing is more bothersome than picking those revolting and unattractive weeds from your beautiful mulch beds. As fast as you pick them --they reappear. End your frustration and do something more productive with your time. Every three months simply apply PREEN Recommended for use with over 200 bulb, flowers, roses, shrubs, trees, and vegetables. Effectively prevents 27 broadleaf and grassy weeds. Easy to apply granular formula takes just a few minutes. Each application lasts for 3 months Ships Quickly!