Can You HydroSeed Over an Existing Lawn?

Existing lawn buried with topsoil.

All plants, including grass plants, need adequate soil space for roots to spread and develop. Grass seed should always have good soil contact to establish properly. We do not recommend burying a patchy lawn with more soil unless it is very thin without removing the old grass first. If we hydroseed over your old lawn, the new grass roots will compete with the root space already occupied by the old lawn underneath. Your new lawn will be competing for soil nutrients, and water if the old lawn survives. If your old lawn is buried deep enough it will start to decompose causing excessive heat to the new roots which will cause your new lawn to suffer and die quickly. Your hydroseeded lawn will look great initially but will eventually thin out by disease and eventually you will be replacing your lawn once again.

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