Pruning reduces moisture loss through evaporation, and saves the leaves and branches from craving for nutrition that the root system is unable to provide once the tree has been uprooted. Uprooting occurs in three stages over three-month intervals, and only once the fibrous roots--which have strong vitality and absorb nutrition more quickly--have grown longer is the tree able to regain its vigor after trans plantation.
修枝是為了減少水分蒸發，以免斷根後，枝葉嗷嗷待哺，根系卻無法提供養料；斷根又得分三次，每次間隔三個月，等生命力強、吸收養分較快的須根多長一些，喬遷後才有較多本錢恢復元氣。