Can You Hydroseed Over an Existing Lawn?

Published Categorized as Lawn Care

Are you looking for a quick and effective method to fix large bare patches or dead spots on your lawn? Consider hydroseeding. This is the technique of spraying a large property with a mixture of seeds, fertilizer, soil amendments, and water. This process aims to establish a lawn, plant a large area, or stabilize the soil quickly. However, it only works well in some situations, but not all. So, can you hydroseed over an existing lawn? Keep reading to find out.

While you can hydroseed over an existing lawn to fix large bare or patchy spots without redoing the entire yard from scratch, it is not recommended. This is the quickest and most efficient method of restoring your property. However, you must use a thinner slurry to avoid suffocating and killing your existing grass. Also, for the process to be successful, mow, clear debris, eliminate weeds, dethatch, aerate, amend the soil, and water your lawn first.

Can You Hydroseed Over Existing Lawn? How to Do It Right

Can You Hydroseed Over an Existing Lawn

One of the best and quick ways of reviving and overseeding a patchy yard is by hydroseeding over an existing lawn. However, ensure your hydroseed mixture or slurry is thin to achieve the best results. It’s worth noting that too thick slurry will damage your existing grass.

Here are the things to do when preparing your lawn for hydroseeding;

1. Mow your existing lawn short, collect the grass clippings, and remove debris and rocks to expose the soil surface.

2. Eliminate all spreading and creeping weeds from your property using a selective herbicide or pre-emergent for weeds. Avoid hydroseeding immediately, as the chemical will hinder seed germination.

3. Dethatch and aerate your lawn as a thick thatch layer and compacted soil will hinder the development of roots.

4. Test soil for pH and fertility. Amend it with compost and lime if it lacks the optimum pH or required nutrients.

5. Water the lawn before and after hydroseeding for the practice to be successful.

6. Hydroseed with the appropriate grass seed mix suitable for your region and soil type.

Benefits of Hydroseeding Over an Existing Lawn

Hydroseeding over an existing lawn comes with various benefits. First, the practice helps prevent lawn degradation by improving the soil structure. Also, adding essential nutrients and organic matter to the soil helps boost yard fertility, resulting in healthy grass.

Moreover, since there is no need to clear the existing turf before hydroseeding, the process is more time and cost-effective. Generally, it is a fast and effective method of reviving large landscapes and lawns.

Hydroseeding also provides even grass seed coverage compared to other methods like broadcast and hand-seeding.

Cons of Hydroseeding Over an Existing Lawn

Hydroseeding over an existing lawn similarly has some downsides. First, you’ll damage the grass if you don’t complete the process perfectly. Also, the practice cannot succeed if the existing grass is too thick, as the slurry will not penetrate the soil.

Furthermore, the outcomes will be less-than-desirable if you do a hydroseeding procedure without a skilled lawn care professional.

Frequently Asked Questions (FAQs)

Q: Is hydroseeding quicker than regular seeding?

A: If you hydroseed your lawn, the new grass seeds will grow faster than when seeding traditionally. Generally, hydroseeded lawns germinate within 5-7 days. This is due to the fertilizer in the hydroseed mixture.

Q: What do you mix with hydroseeding?

A: To make the best slurry or hydroseed mixture, mix grass seeds, fertilizer, mulch, water, tackifiers, soil amendments, lime, and dye. These components will help establish a large lawn and stabilize the soil quickly.


Every homeowner wants to grow a healthy, well-maintained lawn to enjoy all summer cost-effectively. Hydroseeding is a perfect solution if you want to revive your property faster.

However, for the process to be successful, you must use a thinner slurry. This is because a thick, hydroseed mixture will suffocate and kill your existing grass. Also, ensure you mow, clear debris, eliminate weeds, dethatch, aerate, amend the soil, and water your lawn first before hydroseeding.

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