What soil pH refers to is the acidity level of your garden soil. If you have a rating below 7 that means that your garden soil is acidic. If the pH is 6 to 7 it means it is slightly acidic. This is the most fertile pH range for your soil. If your soil pH is above 7 it means that the soil is alkaline. It it goes above 8 it is basically infertile soil.
If you have garden soil that is either too acidic or to alkaline they can be treated to make them better for growing. So, how do you know what the pH of your garden soil is? You get a soil test. These test will tell you the nutrient levels of your soil, the amount of organic matter and the pH.
