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  • Writer's pictureBella Terra

Hydroseeding 101: Preparation Tips You Need to Know

Updated: Jan 31

Preparing the soil for planting a lawn is a crucial step to ensure healthy grass growth with hydroseeding. Here are the general steps we recommend following. And if it seems like too much or you would rather leave it to the professionals, we're here to help!


1. Spray herbicide:

Roundup will kill broadleaf weeds and can be hydroseeded as soon as three days after. With a herbicide that kills clover, hydroseeding can be done after a month.

2. Conduct a soil test:

Although not required we highly recommend this to determine the pH and nutrient levels of the soil. This will help detail what amendments are needed to create an optimal growing environment. We especially look for PH levels. The pacific northwest is more likely to have high acidity levels and can be amended with lime.

3. Till the Area: 

Remove any existing grass, weeds, rocks, or debris from the area where you plan to have hydroseeded. You can use a shovel, rake, or a sod cutter for larger areas. You do not want to go any deeper than 4”-6”. The deeper you go the higher the potential to bring in new weeds or unwanted vegetation.

4. Level the Soil: 

Leveling can be done with a rake to create a smooth, even surface. This helps with uniform grass growth and makes mowing easier. Lime can be added at this time as well if shown to be needed from soil samples.

5. Wet & Grade the Soil if needed:

Wetting the soil is necessary to compact the soil and ensure proper grading to promote water drainage away from buildings. The soil should slope away from structures to prevent water accumulation. You should not sink more than 4-6”. If it does even after wetting, a roller can be used to compact further. This also helps us hydroseed your lawn and leave it smooth. Residential work is usually done with two people and a hose that pushes the product out. If the surface is too fluffy it may make it difficult not to leave footprints and hosemarks.

5. Topsoil:

If using compost as opposed to topsoil we would not recommend putting more than ⅛” deep because overtime it will decompose and will affect how the growth of grass compares to the surrounding structures.

Soil prepared for hydroseeding

If there will not be someone onsite to direct the areas getting sprayed we highly recommend using spray paint, stakes or flags to outline the area. This helps create a more crisp line and stay within the areas intended for hydroseeding.


Choose the Right Grass Seed:

Select a grass seed that is suitable for your climate, soil type, and sun exposure. Consult with local experts or garden centers for recommendations. Take a look at our Hydroseeding page to see our typical grass seed blends.

Be patient and allow the grass to grow. Follow a regular maintenance routine, including watering, fertilizing, and mowing, once the grass reaches the recommended height.


Remember that specific details may vary based on your location, climate, and the type of grass you're planting, so it's always a good idea to consult with local gardening experts or extension services for tailored advice.


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