Preen� mulch with extended control weed preventer is the only landscape mulch that comes with added Preen� weed preventers already mixed in. In one easy step, apply mulch and block weeds for up to six months guaranteed. It's available in three non-fade colors russet red, chestnut brown and midnight black all guaranteed to stay colorfast all year. While it is recommended to spread ordinary mulches 3 in deep, Preen� mulch with extended control weed preventer can be spread only 2 in deep because of its additional built-in Preen� weed barrier. This means that each bag covers 12 sq-ft of ground. That's 30% more ground coverage than ordinary mulches while also providing effective, long-lasting control of broadleaf and grassy weeds. Preen� mulch with extended control weed preventer prevents 100 types of problem weeds, including tough dandelions, crabgrass, annual bluegrass, prickly sida, spurge, field bindweed ladysthumb, shepherd's purse, Carolina geranium, black nightshade, plantain, chickweed, henbit, prickly lettuce, morning glory, horseweed/marestail, prostrate knotweed and many more. It stops weeds before they start, by keeping weed seeds from germinating. Weeds that don't grow never need pulling. In addition to preventing weeds and adding a professional, finished look to landscape beds, a layer of Preen� mulch with extended control weed preventer helps to moderate soil temperature. Plus, it helps plants retain water to protect against heat and drought.