Creating the perfect woodland garden begins with soil preparation, although some special considerations must be made for the site. And Plainview Farm was no different. When we began, what soil remained around the pine trees here was fairly useless, dry and nutrient-depleted, and needed desperately to be built up and improved.
Our technique:
To begin, we tilled the existing soil 3-5 inches deep with a rototiller. Although tree roots were vulnerable, we were careful to minimize damage. Additional soil was brought in and added, as was available compost (such as, animal manures and any other decomposed organic wastes, which added nutritional content and structure to the soil). All of this material was spread across the existing soil and then was blended into it. In this way, the original soil is mixed with the new soil and eliminates layers of different soil types, giving a more uniform soil for the best root growth. We added lime (and this is repeated every third year). We were especially careful to keep it away from plants that require acid conditions. We add lime because these gardens include plants not normally found in a woodland. Fertilizer is handcast across the gardens every second year.
The volume of amendments added helped create the raised bed effect we wanted—good for the plants, good for looking at them, too. After the soil was ready, paths were made by shoveling the path soil up onto the garden area. It is easier to do this, if you have made a trail of lime or even landscape paint to mark where the paths will go. Rake the new planting beds smooth. Be careful not to bring soil more than one inch against the tree trunks. In the 10 years since our gardens were created, no damage has been done to the trees.
We allow the pine needles to create a lazyman’s mulch. Fallen pine needles are removed from certain non acid-loving plants, while in other areas they create a natural mulch. 
We monitor the depth of pine needles to be certain that the plants are not hampered by excessive slow-to-decompose pine needle debris. If they become compacted after a few years, this mass is removed. This is critical to the harmony of the varieties we incorporated into our gardens. Remember: many woodland plants grow within the top 3-4 inches of soil. Our deep soil, however, benefits the trees and shrubs we have installed in this garden. It is due, in large part, to this lovely soil that the woodland garden has become the special place it is.