How to Grow Grass on Concrete

Remove loose pieces of concrete. They will impede the planting of grass.

Spread topsoil over the concrete. You need at least 4 inches of soil to give the grass roots the space they need to grow and spread. If there are low-lying spots or dips, apply more topsoil to create a level planting surface. Dips will lead to the pooling of water when it rains, which can diminish the quality of your lawn.

Spread a starter seed fertilizer over the topsoil. This will encourage the grass to germinate quickly and successfully. Use the application guidelines on the package. Compost will also work well.

Combine the fertilizer with the topsoil. Till it together with a garden hoe. Work the soil until you are sure they are mixed well.

Plant a grass seed that is hardy and low maintenance. Creeping red fescue, for instance, is a type that will grow almost everywhere. Mixing it with other types like St. Augustine or centipede grass will also improve the growth.

Broadcast the grass seed with a hand or mechanical spreader, depending on the size of the lawn. Follow the seed rate guidelines that are specified on the package of seed. Make sure to apply an even amount of seed. Too much will cause competition for nutrients and too little will leave gaps.

Rake the seed gently to mix it with the top 1/4 inch of soil. The soil will hold it in place, keep birds at bay and promote germination.

Water the grass seed with a sprinkler set to an oscillating setting. This will disperse the water evenly without pooling. Watch carefully to make sure you don't water it too much. The concrete doesn't allow for the best drainage, and the seed will get too saturated to grow. Keep the soil lightly moist as the seeds develop roots.