Rhubarb usually occurs in the third and fourth years of autumn, when the shoots and leaves of the aboveground shoots fail. It was determined that the content of effective components of rhubarb gradually increased before the seeds matured, and apparently decreased after the seeds matured. Therefore, it is not necessary to leave the species of rhubarb after flowering. After digging up the fresh roots, do not wash with water, peel off the skin, cut into large pieces, cut in half in small pieces, and naturally dry or smoke dry, that is, rhubarb herbs. About 500 kilograms per mu, the current market price of about 10 yuan per kilogram.
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