https://www.alamy.com/in-the-var-department-oak-trees-are-used-for-truffle-cultivation-only-after-10-years-the-first-truffles-can-be-harvested-from-a-tree-at-the-age-of-20-30-years-the-truffles-become-smaller-growing-on-the-roots-of-the-trees-bauduen-france-image455216678.html