Your lawn has low spots, uneven ground, or areas where water collects after rain. Someone recommends sand. Someone else suggests topsoil.
Which should you use?
Both can be appropriate, but the right choice depends on the job and the soil already in your yard.
What Kind of Leveling Are You Doing?
Not all lawn-leveling projects are the same.
- Light topdressing: Spreading a thin layer of material over existing grass.
- Shallow depressions: Filling small low spots without significantly changing the yard's slope.
- Substantial grading: Raising or reshaping larger areas, which may change how rainwater drains.
- Preparing for new grass: Adding or improving soil before planting, without having to protect existing grass.
These differences matter because a material suitable for one job may not be suitable for another.
Can You Put Sand Over St. Augustine Grass?
Yes, under certain conditions. Sand or sandy soil may be suitable for light topdressing, especially when it matches the existing soil.
However, St. Augustine grass grows through above ground runners called stolons. Covering these runners and living grass with too much material can damage or kill the lawn.
The University of Florida's Institute of Food and Agricultural Sciences (UF/IFAS) recommends approximately ¼ inch of soil similar to the existing soil for periodic topdressing to help reduce thatch buildup.
This recommendation addresses a specific lawn-maintenance purpose. It does not mean homeowners should spread several inches of sand over established grass.
See UF/IFAS — St. Augustine Grass for Florida Lawns.
Will Sand Improve Drainage?
Not necessarily.
Water movement depends on the soil underneath, compaction, and the slope of the yard. Adding sand over compacted soil does not remove the compaction. Different soil layers can also interfere with drainage.
Although many Central Florida lawns have sandy soil, construction fill and previous landscaping can change those conditions.
If water repeatedly collects in one area, the problem may require drainage or grading corrections rather than simply adding sand.
Which Material Should You Choose?
Topsoil: May be suitable for filling bare areas, preparing ground for new grass, or certain shallow corrections. Its composition varies, so it is not automatically suitable for every lawn.
Red sand: May work for certain fill or soil applications. Its red color does not determine whether it is suitable for an established lawn.
Mason sand: A relatively fine sand commonly used in masonry work. Its texture may not be appropriate for lawn topdressing.
Coarse sand: May be appropriate for certain sandy-soil applications, but particle size and compatibility matter. It does not automatically improve drainage.
No single material is the best choice for every yard.
What About Deeper Low Spots?
If a depression requires several inches of material, simply covering existing St. Augustine grass can bury and damage it.
A deeper correction may require preparing the area and reestablishing grass afterward. Larger grading projects may also affect drainage around your home or neighboring properties.
Before ordering material, ask whoever recommended it:
- Why is this material appropriate for my yard?
- How deep will it be applied?
- Will the existing grass remain exposed?
- Is the goal to smooth the surface or correct a drainage problem?
For uncertain soil conditions, drainage problems, or major grading, consult your local UF/IFAS Extension office or a qualified landscape professional.
The Bottom Line
Sand is not always wrong, and topsoil is not always better.
Before purchasing material, understand what problem you are trying to solve and whether the material is appropriate for that job.
That's the best way to avoid buying the wrong material or creating another problem in your yard.
