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Never wash the plants before putting them to dry. Spread them out in a single layer. For the first few days keep turning them over so that the drying is even and thorough. When the drying is over, cut them into small pieces, and store the herbs in a clean bottle with a lid. In the case of roots, they must be washed and cut into small pieces before drying.
Never store the herbs whether dry or fresh, in plastic bags or wrappings. Scientific experiments have shown that plastic wrappings bring about certain chemical alterations, and the herbs kept this way no longer have the same efficacy.