We found a great explanation of how to have your soil tested and why it is so important. Here's a quick excerpt:
Why Test Your Soil?
Dirt may look pretty straightforward—dirt is dirt, right? But the soil in your garden beds and under your lawn is actually made up of several components: clay, sand, and silt, as well as water, air, and organic matter. The proportions of clay, sand, and silt are what determine how well your soil supports the things that are growing, how much moisture it holds, and how well it drains.
Click on any of the images below to read the step-by-step guide to testing the soil in your yard and garden.