If you have a gas-powered lawnmower and want to stop spews emissions, then bring it to the Herring Run Watershed Association's native plant sale Oct. 18 and trade it in for a voucher toward the purchase of a quiet, energy-efficient lawnmower with a rechargable battery.

The "Cash for Lawn Guzzlers" program, sponsored by Together Green, Audubon Maryland-DC and the Herring Run Watershed Association, will allow Baltimore gardeners to exchange their gas-powered mowers for $110 coupons toward the purchase of a Neuton battery mower. Prices for the cordless, rechargeable mowers range from $299 for a reconditioned model to $439.

Program sponsors say using a gas-powered mower releases as much emissions as driving 10 cars for that same amount of time, and their electric counterparts only use $5 worth of electricity per year. The exchanged mowers --- just push models, no riding mowers --- will be recycled by Baltimore's Department of Public Works.

The Herring Run event runs from noon-4 p.m. Oct. 18 at the Herring Run Nursery, 6131 Hillen Road, in the Mount Pleasant Golf Course. Only one mower will be accepted per household (and only one coupon issued).