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Pine bark mulch saves water and reduces weeds, but it can cause problems. Mulch reduces weeds by blocking light from the soil below, preventing seeds from sprouting. Mulch also helps to keep soil moist and moderate its temperature. Pine bark mulch is an inexpensive organic product that gradually decomposes, adding humus to the soil and giving it a loose, crumbly texture.
In the diagram you can see that a pine log is actually made up of a number of layers. Both the rough outer bark layer and the main woody part of the tree commonly used as lumber is non-living material. The edible part of bark is the âinner barkâ or âphloemâ; the actual living part of the tree. This inner bark carries nutrients from the needles and roots throughout the tree. To harvest the living bark for food you will need a fresh tree.