3l 2 enPine Bark is a great component of potting mix that can be used to create aeration in your mix, or to plant orchids in! The main difference between coco chips and Pine Bark is their water retention, coco chips retain water for much longer. The difference between regular French tree bark and pine bark is that pine bark is steamed to prevent rot &; and mold. Allows oxygen to penetrate into the soil substrate Absorbs water easily Ideal for orchids