Soil is the most important element when growing a green lawn. It ensures the overall health of the grass. Before laying down grass seed, it's essential to prepare the soil. Any topsoil brought in needs to be tilled into the local soil so that the grass roots don't have two separate soils to cope with. No matter the type of soil in your region, amendments should be made to make it the most nutrient-rich soil possible.
Prepare the soil for grass seed by clearing away weeds, rocks and other debris. If there are soil clumps larger than 1 inch in diameter, break them up. Smaller ones will not interfere with growing green lawn. Till the entire planting area to a depth of 4 to 6 inches.
Lay down topsoil to level off the planting area. Transport it to the lawn with a wheelbarrow and shovel it into the dips. Mix it in to ensure the grass roots penetrate the native soil as well as top soil. Spread it out with a rake until smooth and level.
Add compost and sand on top of the soil. This will give the soil more nutrients and better drainage capabilities. Lay down 1 inch of each substance, speading it out and rototilling it into the top 1 inch of soil.
Enrich the soil even further by adding a fertilizer high in phosphorus. Starter seed blends will also help achieve the greenest lawn. Spread it with a broadcast spreader, setting the unit to the rate indicated on the packaging.
Spread grass seed with a hand spreader or mechanical spreader, depending on the size of the planting area. Use the back side of a rake to lightly mix the seed into the top of the soil mixture.
Set a sprinkler to an oscillating setting to water the area. Do so for five to 10 minutes twice or three times a day for the first 10 days. Once the grass seed starts to germinate, water every day for 15 to 30 minutes.
Mow the green lawn when the blades of grass are 3 inches tall. Set the mower to a 2 1/2 inch height.