Heavy Weight Sheets. Looking for Earth-friendly weed-barrier mats for your planting sprees? Circle up! Each round sheet comes with a neat slit and center X, so you can easily slip it around the trunk or stalk of the plant. Cover with a light layer of mulch and sit back while your weed-free plantings become the talk of the town. These sheets are heavy weight (54% heavier stock than WeedGuardPlus), so you can anticipate season-long weed suppression in established annual beds. For extended weed control (6+ months) when establishing new landscape plantings, consider using two layers. 18" diameter. Dark brown color.