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While hydroseeding is designed for bare soil, it is possible to apply it over an existing lawn with certain adjustments. For the new seed to be successful, it needs good seed-to-soil contact to germinate and take root. Without proper preparation, most of the new seed will fail to establish and will die. To hydroseed over existing grass, first mow the lawn as low as possible, then loosen and clear any exposed soil. It is also recommended to use a finer mulch mixture in the hydroseed spray, which helps the seeds penetrate the existing turf and reach the soil without suffocating the established grass.

Not only are lawn depressions unsightly, they also cause your yard to be uneven and have divots, which can be a tripping hazard. Lawn depressions also make mowing more difficult and can potentially cause damage to your mower.

Whether you’re putting down fresh seed or reseeding, there are a few things to keep in mind when seeding your lawn. Be sure to choose the correct seed for your climate, seed at the right time of year, and water two to three times a day for the first week. Generally, Dudley recommends seeding in spring and fall as it is usually cooler and rainier.

Aerating a lawn before seeding it or adding new grass seed is a smart decision. By loosening up compact soil and allowing it to take in more air and water, your seeds will have an easier time establishing roots and growing. Aerating beforehand also means your seeds will have better contact with the soil, so more of your seeds have a chance to germinate. If you do plan to aerate your lawn before seeding, aerate about two days before you plan to start seeding.