First, it can be regenerated.
The roots of Flammulina velutipes can be regenerated, and the cut roots don't need to be thrown away. It only takes a few simple steps to make the roots grow again. Prepare a small bottle or plastic bag, put a paper towel in it, wet the paper towel with soda water, put the cut roots on the paper towel and quietly put them in a dark place where the sun can't shine at all. In a few days, new ones will grow.
Second, the storage mode
After cutting off the roots of the bought fresh Flammulina velutipes, regenerate the roots according to the above method, soak the cut roots in the prepared light salt water for a few minutes, take them out and slowly drain them to stop dripping. Then it can be stored in the freezer. According to this method, it can be preserved for about a week, but in order to ensure a better taste, it is better to eat it early.