Why should you have your soil tested? If you like azaleas but your soil has a high pH (i.e., the soil is basic rather than acidic), you will not have azaleas with stunning spring foliage. If your soil does not have sufficient nutrients, you will not be able to grow a robust garden. Soil testing will provide you with the information you need to treat your soil so your plants will flourish. This sheet will show you how to take a soil sample.