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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.
When placed on the soil surface as mulch, wood/bark chips do not tie-up soil nitrogen. However, incorporating wood/bark chips into a soil can create a nitrogen deficiency due to a carbon-to-nitrogen imbalance, and can interfere with seedbed preparation.