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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.
What is pine bark extract? Pine bark extract is extracted from the inner bark of certain European pine trees. Although PycnogenolÂ® is the most studied pine bark extract, all pine bark extracts contain the same active compounds, which include the powerful antioxidants oligomeric proanthocyanidin compounds (OPCs). Pine bark extract: 1  Helps strengthen blood vessels and increase blood flow from.  tiny vessels to tissues.