Abstract: A quickly installable mulch-type accessory for a walk-behind or riding mower, having a deck with a deck opening for discharging grass clippings, includes a removable mechanism having a covering portion dimensioned to operably cover the deck opening of the mower; a connector mechanism fixedly secured to the deck of the mower, the connector mechanism structured and dimensioned to removably mount the removable mechanism to the deck of the mower wherein the covering portion assumes a blocking position whereat grass clippings are operably prevented from being discharged through the deck opening of the mower; and a lock mechanism structured and dimensioned to selectively and releasably lock the covering portion of the removable mechanism adjacent to and covering the deck opening.