In addition to fertilization, an intact soil life is also important for the plant's nutrient uptake. A bonsai benefits here especially from mycorrhizal fungi that live with it in a symbiosis. The fungus bonds with the roots, improving the plant's nutrient and water uptake as well as drought and pest resistance. In return, the fungus receives some of the glucose produced by the plant. Pine, spruce, beech and oak bonsai in particular benefit from the symbiosis.