The soil in your garden was created over thousands of years through the disintegration and decomposition of rock and organic matter. Temperature and rainfall, the life and death of plants, animals and bacteria and fungi, and the rocks that were there to begin with: all contributed to the soil you find in your garden today. The principal components of soil are minerals, organic matter, air, and water. Soil minerals and organic matter make up the solid part of your soil. Air and water occupy the pore spaces between your soil's solid particles. All of these provide nutrients, moisture, and anchorage for plants. Depending upon where you stand in your garden, these components are present in varying amounts. The particles in your soil are many sizes and shapes. Coarse particles such as gravel and stones are not conducive to plant growth. Your garden can do without them. The soil particles that support plant growth are divided into three sizes: sand, silt, and clay. Sand particles are the largest of these three; the clay particles are the smallest. The combination of sand, silt, and clay in your soil is called soil texture. Soil texture affects your soil's fitness for growing plants, sometimes called tilth.
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