Why and How to Sand a Lawn?
Why Sand a Lawn
The main purpose of sand topdressing is to improve the physical properties of the soil. Fine quartz sand penetrates between grass blades and into the soil, reducing compaction, improving water infiltration, and supporting new shoot growth. Sanding also levels minor surface irregularities, improving mowing quality. In addition, it helps break down thatch—organic matter that accumulates between the roots and the soil surface and can block water and nutrient penetration.
When Sanding Helps and When It Harms
Sanding is especially useful for lawns with heavier, clay soils, which tend to compact easily. It improves permeability, aeration, and drainage. On sandy soils, sanding has no real benefit—on the contrary, it could further reduce the soil’s ability to retain water and nutrients.
The best time for sanding is spring or early autumn, when the lawn still has enough time to recover. It is definitely not recommended during dry periods and high temperatures. Likewise, avoid sanding during heavy rainfall, when it is very difficult to work the sand into the soil.
What Sand to Use and How to Work It In
Use fine quartz sand with a grain size of 0–2 mm (≈ 0.08 in). This type is fine enough to penetrate the soil but does not clog its pores. Never use construction sand containing limestone—it could alter soil pH and damage the lawn. Spread the sand evenly across the entire surface and work it into the turf—ideally with a special leveling drag or broom.Connection with Aeration
Sanding is often combined with aeration. After perforating the soil with hollow tines, the lawn is full of small holes into which the sand easily settles. This improves soil structure directly in the root zone, where it has the greatest effect. Aeration followed by sanding is the ideal combination to improve drainage, reduce compaction, and promote healthy growth.
On 100 m² (≈ 1,076 sq ft) of lawn, about 1 metric ton (≈ 2,204 lbs / 1.1 US tons) of sand is usually applied after aeration, depending on the degree of unevenness and the goal of sanding. You can find more information about aerating in this article.