Preen garden weed preventer prevents summer and winter annual weeds from growing in flower and vegetable beds and aroundtreePrevents new weeds from growing it does not kill existing weeds.Recommended for use around ornamentals.Will not harm most established plants granular easy to use formula.Apply any time: spring summer or fall.Active Ingredient: 1. 7% Trifluralin.Dimensions (L x W x H):28.3 x 16 x 5