Turn Clay Into Growing Soil

Clay soil is great for making bricks, but it's not so good for growing plants. So here are some ideas on what you can do to improve the condition of your clay soil.

Steps

  1. Get your soil tested. Check with your local extension office (listed under government in the phone book) for a soil testing kit. Follow the directions on the kit, and ship it to the state lab. This is a low-cost method to give you detailed information on what components are needed to improve your soil.
  2. Add the suggested amendments to your soil. Those amendments are normally found in fertilizer. The side of the bag lists a ratio such as "10-10-10" that identifies the relative amounts of NPK found in the bag (that's nitrogen (N), phosphorus (P), and potassium (K)). If you are an organic gardener, use organic fertilizers in your garden, as well as compost.
  3. Clay soil may also need some secondary macronutrients, such as calcium (Ca), sulfur (S), and magnesium (Mg). These nutrients can be side dressed on your plants as needed.
    • Purchase sulfur at your local nursery.
    • Calcium can be found in eggshells. Just crush them up and sprinkle them around your plants.
    • Epsom salts contains magnesium. Make a mixture of 1 tablespoon of Epsom salts to 1 quart of warm water, mix well and spray your plants with the mixture. Tomatoes and peppers especially like the mixture. It will encourage those plants to set blossom more quickly.
  4. Consider using a winter Use Green Manure Crops such as annual rye or any legume. For particularly heavy clay soil, hairy vetch is an excellent choice. It has an extensive root system which helps to break up the clay and provides valuable nutrients when turned under.
  5. When starting new beds, consider using the "lasagna" method to prepare the soil. Lasagna gardening is a no-till method for preparing soil and it helps to break down clay soil. This method uses layers of material, such as shredded black-and-white newspaper, compost, and coir. You build multiple layers as deep as possible and allow them to break down over time. There is detailed information on this subject to be found online. Some additional items you can add to your lasagna beds:
    • Grass clippings
    • Leaves
    • Fruit and vegetable scraps
    • Coffee grounds
    • Tea leaves and tea bags
    • Weeds (if they haven't gone to seed)
    • Manure
    • Compost
    • Seaweed
    • Shredded newspaper or junk mail
    • Pine needles
    • Spent blooms, trimmings from the garden

Tips

  • Breaking down clay soil takes time and patience, but it is possible and the results will give you rich, organic soil which will grow almost anything.

Warnings

  • Use only composted manure on your beds. Raw manure contains pathogens that take time to be destroyed.
  • Use only black-and-white newspaper. Pull the colored ads for recycling. Normally, colored sheets contain harmful chemicals.

Sources and Citations

  • Lasagna Gardening by Patrica Lanza - Research source.

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