Floating row covers promote better growing conditions in early spring resulting in higher yields. They're easy to apply and 'float' gently on top of crops, no supports needed. The spun bonded polypropylene covers conserve moisture and offer protection from heavy rains, harsh drying winds, insects, birds and other pests. The porous fabric allows water and fertilizer to penetrate, allows light transmission, and ventilates excess heat on sunny days. Covers should be removed when temperatures are consistently warm. For best results, before installing covers, use a plastic mulch to control weeds. Also ideal for covering new lawn plantings-more effective than straw. 5' x 50'