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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.
Wood chips, bark chunks, and pine needles are appropriate mulches for shrub beds or around trees. Fine mulches, such as bark granules, wood shavings, cocoa shells, and buckwheat hulls, are attractive when used in annual or perennial beds. Fine gravel or crushed stone mulches look most natural when used in rock gardens.