It's best to get a soil analysis through your state's Extension Service. Contact your county agent for the soil test kit. You'll tell them what you plan to grow and they'll tell you how to amend your soil to meet the needs of the plants. Some plants are acid-loving and some prefer alkaline soils. People insist on trying to grow plants that are not suited to their soil, but the amendments you put in ten years ago have leached down into the native soil. In Dallas, we have black gumbo clay soil that's very alkaline. Everybody wants to grow azaleas, which do beautifully 100 miles east of us. It can be done,, but it takes work.