👉 Mycorrhiza is a symbiotic relationship between plants and fungi that occurs in moist soil. It is a type of fungus that grows on the roots of trees, but it also grows on the roots of plants themselves. This helps to improve the structural strength of the plant, making it more resistant to diseases and pests. In addition to improving the structure of the plant, mycorrhizae can also help to increase the amount of water and nutrients that are available to the plant. This is