A lawn seeder (also known as a “overseeder”) can be used to help fill in bare patches of grass or to plant new seed to invigorate your lawn with new growth.
A lawn overseeder is a machine that slices seed into existing lawns to fill bare patches or to plant new seed on bare ground. An overseeder can also be called a slit seeder due to the way the thin blades slice the soil. A seed bin, that is attached to the machine, drops the seed and the blades slice it into the soil creating a good seed to soil contact. Its best to make two cross-hatch-style passes that are at a 45 degree angle one way and then a 45 degree angle the other way creating a diamond pattern.