Auricularia auricula is produced in the northeast after autumn, when the moisture of Auricularia auricula is relatively large and humid; In winter, although some water is lost, many of them still contain water, but it is not easy to feel it at this time. After the spring breeze in the following year, most of the water was lost, and the fungi were relatively dry at this time. But this makes the price of black fungus slightly higher than that in autumn and winter. But the fungus at this time is easy to preserve.