Lawn Site Preparation Whether seeding or sodding, the site must be properly prepared. Use a herbicide such as Round-Up or Kleen-Up to kill existing vegetation. This is especially necessary if problem weeds such as quackgrass, tall fescue or bentgrass are present. Rototilling such weeds into the soil just spreads them around and will not kill them. The same procedure is needed to kill off an existing lawn prior to starting a new lawn. Remove any debris that may be left from construction. Debris buried just below the soil surface can result in localized dry spots that will be a problem once the lawn is established. Establish the final grade, making sure there are no low areas where water can collect. Where the soil is packed down, cultivate as deeply as possible. Many times topsoil is spread over the existing soil. To be a help, at least 6 inches of topsoil are needed. A 1 or 2 inch layer will probably result in poor water movement and a very shallow-rooted lawn. Either put on at least 6 inches of topsoil or don't add any. If topsoil is added, mix some of it into the top 3 inches of existing soil. This will promote water movement from the added soil into the existing soil. Prior to planting, fertilizer and lime should be worked into the soil as recommended by a soil test. Do not add lime unless soil test results indicate a need. If the soil is not tested, use 15 to 20 pounds of 12-12-12 or 16-16-16 per 1000 square feet prior to seeding. When sodding, use 10 pounds of 5-20-20 or similar fertilizer per 1000 square feet. Work the fertilizer into the top 3 inches of the soil. Rake the soil to level the seed bed and establish the final grade. The soil should be 1 inch below driveways and sidewalks. It is now time to plant. For planting sod: Sod can provide a lawn in a shorter time than seed. A prime disadvantage of sod is the limited number of grass species included in sod mixes. Most sod is a blend of several Kentucky bluegrass cultivars. Sodding can be done when the soil is dry enough to work and the sod will have enough time to root before winter. Do not lay sod during dry weather if water can not be provided. Rolled up sod heats up and this heat can kill the sod. To avoid injury, lay the sod within 24 to 48 hours after it was cut. Do not lay sod on hot, dry soil. Moisten the soil to a depth of 6 inches. Lay the sod in a pattern that looks like bricks in a wall. This can be done by starting alternate rows with half a roll of sod rather than a full one. The edges of the rolls should be touching to prevent the sod from drying out. Once all the sod is laid, rolling will remove air pockets. Sod laid on a slope can be held in place with wooden stakes. Water the sod immediately after rolling. Water every day after laying the sod until the roots have grown into the soil. Rooting can take 2 to 3 weeks. Reduce watering gradually once the sod has rooted into the soil. Courtesy: The Horticulture Department MSU.