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In winter, the temperature is low and the vines suffer freezing injury. If the root rots, the xylem becomes dark brown, indicating that the roots have been frozen to death; the root bark is yellowish-yellow, the xylem is brown-yellow and half dead roots; the cortex is yellowish, and the xylem is m... We are blog of Medicinal Foods,Dietary Supplement,Health Food Supplements in China, if you want to buy Medicinal Foods,Dietary Supplement,Health Food Supplements, please contact us.