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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.
Long-term use of the same type of mulch may change the surface soil's pH. Acidic mulches such as pine bark, pine needles and peat moss may have a pH of 3.5 to 4.5. When you apply them continually, they may, over several years, cause the surface soil to become too acidic.