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Power seeding machines do a great job of creating narrow trenches in the soil to plant grass seeds into, but aerating before power seeding can be beneficial for your lawn. By aerating first, more water, oxygen, and carbon dioxide can reach the roots of your germinating grass seeds. Plan to aerate your lawn about once or twice a year, whether you plan to power seed or not.

Hydroseeding over an existing lawn is possible, but certain adjustments are necessary since the process is for bare soil. Hydroseed mix is ​​usually very thick, which helps protect the seeds during germination. If you have existing grass on your site and still want to hydroseed, it's better to use a finer mulch mixture when spraying. A finer mulch mix means the seeds can root into existing soil without suffocating the existing grass.

When it comes to combatting the effects of soil compaction, core aeration does a far better job for a longer period of time—because it actually removes dirt rather than just pressing holes into it. By taking dirt out from under your lawn, core aeration allows more light, air, water, and nutrients to penetrate into the soil below and help your grass’s roots grow even stronger.

Many factors can cause your yard to have lawn depressions. Here are the most common reasons: 

• Heavy rainfall 

• Wild animals such as moles, voles, and groundhogs that burrow and tunnel

• Poor drainage

• Buried items such as pipes that break down

• Decaying tree roots or stumps

• Soil that has compacted

• Improper mowing techniques

• Driving heavy equipment and vehicles through the yard