Thatch consists of a dense mat of roots, stems and grass clipping, which accumulate between the soil and growing turf layers. Excessive thatch creates a barrier, preventing the absorption of water and nutrients, as well as limiting air flow to the root system.

Allowing thatch to develop on an otherwise healthy lawn reduces the effectiveness of pesticides and creates an ideal environment for insects and turf diseases.

Lawns often suffer from both compacted soil and thatch build-up. Compaction can be particularly serious in the top two inches of the soil layer. It reduces water and fertilizer uptake by the grass roots, thereby decreasing a lawn's tolerance to heat and drought. It also increases the amount of runoff from watering or the application of fertilizers and pesticides.

Mid to late spring and early fall are the most ideal times to aerate Kentucky Bluegrass and perennial Ryegrass. Turf grasses such as Bermuda, Zoysia and St. Augustine should be aerated mid spring to summer. Aeration before applying herbicide, fertilizer and water is recommended.

Lawns suffering from thin, bare patches or those without any grass at all require aggressive renovation techniques. The lawn may be revived by overseeding with a Lawn Seeder.

The hopper drops a measured amount of seed and the Lawn Seeder plants the seed by blending them into the soil through the action of the rotating knife blades. As the Lawn Seeder moves forward, the neoprene flap smoothes the soil to cover the seed and aid germination.