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It costs $1,500 on average to hydroseed a 1/2-acre lawn professionally. DIY hydroseeding costs about $300 to $500 for the machine rental, plus the cost of your seed, mulch, and fertilizer. Often, it makes sense to hire a local lawn seeding service to hydroseed for you to ensure the best coverage and growth.

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.

If you’re wondering whether grass seed will germinate on top of soil, the answer is yes. In fact, it’s the best way to plant your grass seed. Spread seeds in an even layer on top of loose, fertile soil will allow them to germinate and grow strong roots. Topping them with a thin layer of straw will help them retain moisture and stay put, as well as protect them from getting eaten by animals.

Always mow the lawn on a short setting when overseeding. The thinner coverage offers more space for the grass seed to take root in the soil. When reseeding a lawn, however, you may need to remove your old turf altogether.