Secondly, the soil where truffles grow contains a lot of copper and iron.
Finally, the mountains where truffles grow are mostly north-south, and the air humidity in the mountains is high. It is not easy to collect natural truffles. Traditionally, dogs or pigs are used to find and dig truffles.
In particular, sows are the most sensitive and are natural truffle hunters. In addition to sows, flies also love the smell of truffles, so as long as you observe where there are a group of flies around, it means that there may be truffles underground.