How to Loosen Clay Soil for Planting

Overview

Soil with high clay content can be a gardener's nightmare. Hard soil won't drain properly and tends to inhibit root growth. Fortunately, softening clay or other hardpan soil is quite easy.

Step 1

With the pickax, break up the hard, clay soil to a depth of at least one foot. Use the pointy end of the pickax to break the soil and the other end to slice up clumps of clay.

Step 2

Rake the entire area, further breaking up any clumps with the edge of the rake or your hands.

Step 3

Mix in topsoil with the existing soil and blend thoroughly. The mixture should be at least one-half topsoil; you might need to cart off some of the excess soil you dug out with the pickax. If you like, you may add peat moss or mulch, as well.

Step 4

Apply water liberally to further break down and soften any remaining clumps of clay soil. Mix further with your rake.

Step 5

Let stand overnight, then apply gypsum to the surface using a lawn fertilizer spreader. Use about 40 pounds of gypsum for every 1,000 square feet of dirt. The gypsum will penetrate any remaining fine clay particles and loosen the soil structure, creating air and moisture spaces critical for root growth and development. Water thoroughly and immediately.

Tips and Warnings

  • Gypsum contains no nutrients, so you will still need to fertilize your plants once they are established.

Things You'll Need

  • Pickax
  • Rake
  • Topsoil
  • Peat moss or mulch (optional)
  • Gypsum
  • Lawn spreader

References

  • Ed Hume Seeds
  • Hum Gardens
Keywords: loosening clay soil, clay soil treatments, uses of gypsum

About this Author

Thomas K. Arnold is the publisher and editorial director of Home Media Magazine and a regular contributor on entertainment to "USA Today", "The Hollywood Reporter," "San Diego Magazine" and other publications. An alumnus of San Diego State University, Arnold has appeared on such TV shows as "CNN", "E! Entertainment" and "G4's Attack of the Show" to discuss home entertainment and technology issues.