How to Amend Soil With Perlite

Perlite is a volcanic mineral and a suitable soil amendment for both clay and sandy soils. Perlite has the ability to retain moisture -- a must for sandy soil. In addition, each perlite particle contains air passages, which improve aeration and drainage -- a must for clay soil. Perlite is available in different sizes and according to the Perlite Institute, the coarser grades are suitable for gardens and lawns.

Rototiller, garden fork, shovel, spade or hoe
Fertilizers
Lime or sulfur
Peat moss

Instructions

- 1
  Turn over the soil approximately 10 to 12 inches deep. A rototiller will make this task easier and is usually available for rent at home improvement stores or equipment rental centers. You can also use a garden fork, shovel, spade or hoe. If the soil is too rocky or compact to go 10 to 12 inches deep, go as deep as possible, ideally at least 6 inches.
- 2
  Apply 3 to 6 inches of perlite on top of the soil. Also apply any additional supplements, such as fertilizers, lime or sulfur, as indicated in a soil analysis from a cooperative extension office or soil testing laboratory. You can also add peat moss if the soil lacks rich, organic matter. In this case, add 2 to 3 inches of both perlite and peat moss for a total of 4 to 6 inches of amendments.
- 3
  Work the perlite and other supplements into the soil as deeply as you turned it over.

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