Wood chip gardening is the practice of covering your vegetable garden and fruit orchard with wood chip mulch. Wood chips will improve your soil and regenerate the natural life in the soil instead of the use of toxic chemicals that deplete the soil and create soil loss. Back to Eden Gardening uses wood chips that are 90% needles, leaves, and branches that have been chipped from tree trimming waste. It is important to understand that the leaves are a source of nitrogen and the branches are a source of carbon. This ratio creates an ideal mulch gardening material when the wood chips have composted. Paul Gautschi has multiple gardens and orchards in which he utilizes both raw, composted, and screened wood chips.