Overseeding can be done in the spring or fall. The best time to overseed is after your lawn has been core aerated. Overseeding introduces new seeds to fill in bare or thin areas as well as thicken up existing areas on your lawn. Overseeding is the perfect complement to aeration as the new holes in the ground will provide a perfect place for “seed to soil contact” and new grass to get established. Have Mass Turf Aeration core aerate and overseed your lawn in the same visit! Our Jonathan Green grass seed has excellent color and improved drought tolerance. Make your lawn the thickest on the block with overseeding!