Truffles like alkaline calcareous soil, which is coarse and loose and easy to drain and breathe. It needs rain in summer, but it needs a little water but not too much, and it is also afraid of heavy and long rain in spring. Because truffles can't photosynthesize themselves to make carbohydrates for growth, they must live with the roots of oak trees and use the roots of oak trees to absorb nutrients. Therefore, the growth range of truffles is generally among trees. Therefore, it is even more difficult to cultivate truffles artificially, such as planting truffle hyphae on the roots of oak trees. After seven to ten years, if you are lucky, it is possible to harvest truffles. Over-ripe truffles will decompose and rot in the soil, release spores, germinate and grow into hyphae, and grow big when they meet the roots of oak trees. Because truffles are very picky about the growing environment, they can't grow as long as the sun, water or soil pH changes slightly, which is why truffles are so rare.