It looks innocent, but a lush, green front lawn is actually the plant equivalent of a gas-guzzling SUV. In most parts of the country, about half of the public water supply is used to irrigate residential yards and gardens - and shallow roots make turf one of the thirstiest landscape features. But now, with record-breaking droughts along the Eastern Seaboard, low water levels in the Great Lakes, and dry conditions throughout the Rocky Mountain states, more and more homeowners feel a new urgency to reduce the amount of water they use on their land.