Hi Lauren, the right soil depends on the plants. Each plant has its own unique needs. If you are in the United States, contact your local Cooperative Extension (do a Google search to find it). Then, ask them how to get a soil test done. With the soil test, they will tell you what you need to add to the soil for specific plants. A rose bush needs different soil than a lawn or an asparagus bed, for example, so it really depends on what you want to grow, where you live, and what your soil is like to start out with. That is why I think it is best to ask locally at the Cooperative Extension near where you live.Good luck.