Severe temperature fluctuations and freeze-and-thaw cycles in the course of the Wintertime induce the h2o in the soil to broaden and contract, which ends up in frost heave the place the plant and its roots get pushed away from the bottom. Sphagnum peat moss is partially decomposed plant product. https://stephenrzfko.verybigblog.com/28518860/little-known-facts-about-bonsai