Mid to late spring 2. Mid to late spring 2. Late summer 3. Using a mulching mower to return nitrogen rich grass clippings to the lawn can significantly reduce the amount of fertilizer necessary to maintain a healthy lawn. For more information about this environmentally compatible practice, contact Berks County Cooperative Extension and request the Recycling Turfgrass Clippings Penn State fact sheet.
Strong roots prepare grass for the rigors of winter and pave the way for a healthy lawn in spring.
Excessive amounts of nitrogen applied at this time foster vegetative growth at the expense of root development and may result in the appearance of diseases later in the summer.