Mulch Lock 16000, Ready-to-Use, Pack of 1 LOCKS IN PLACE: Holds mulch, pine straw, pebbles, gravel, sand and dirt in place for up to 12 months. SPRAY AROUND LANDSCAPING: Use near trees, planting beds, slopes, pathways, borders, edging and driveways. NON-TOXIC: Allows water and nutrients to flow through to plants, shrubs and trees. STARTS BONDING IMMEDIATELY: Maximum bond after 24 to 48 hours. COVERAGE: Covers up to 1,500 square feet.