If you are unsure as to the suitability of your soil, test your soil to determine the pH level. If you find the soil is poor add some nutrients with fertilizer. Also the alkalinity will help you to decide which plants will do best in that location. The more your plants like the soil you already have the less soil reconditioning you will need to do. Also if you find that you want a few special plants you can use containers with specific soil optimized for that plant. You could avoid a major soil reconditioning program that way.