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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.

Throwing grass seed on existing lawn isn’t likely to germinate, grow roots, or become healthy grass. You need to prep the soil, spread fertilizer with your seed, and sow the seed into the soil. Water the seed every day for two weeks to ensure it germinates and grows roots. Be sure to stay off the area and wait to mow until it reaches optimal height.

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.

The screwdriver test involves trying to push a screwdriver into your lawn. If it goes in easily, you’re likely overwatering and should cut back. If there’s moderate resistance, you have a good watering schedule and soil composition. If there’s a lot of resistance or you can’t get the screwdriver into the soil, you may need to aerate your lawn to reduce compaction and increase your watering schedule.