1, don't wash the picked elm, put it in a basin, take a proper amount of corn flour and sprinkle it on elm, mix it gently, then put it in a fresh-keeping bag, tie the mouth of the bag tightly, and put it in the refrigerator for cold storage. This method has a good fresh-keeping effect, but it can only be stored for about seven days at most, which is suitable for short-term preservation of fresh elm.

2. In addition to the methods described above, there is also a sauce-making and preservation method. The specific method is to wash and dry the elm root, then grind the dried elm root into powder, add seasoning and ferment for a period of time to make elm root sauce and preserve it.