To improve heavy soil, so-called 

is used best.

The manufacturing process not only preserves natural sand deposits, but also creates grains with edges and grooves where soil organisms can settle. The edges provide better support for fibrous roots compared to round sand grains (like river sand or aquarium sand).

Application: Mix sand in a ratio of 1:5 evenly with finely sifted dry compost and spread the mixture a few centimeters high on the bed that needs improvement. Use a long-toothed rake (or a similar tool) to work it into the top layers of soil.

Then, either sow seeds or plant in the bed right away and cover with mulch to prevent UV damage.

Crushed sand grains under the microscope