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The sap is collected by tapping the trunk of the tree by different traditional versions. In Japan the koroshigaki method is used.
The 8- 9 year old tree is tapped every four days from June to November. At the end of the season the tree is felled, the sap of the branches collected and new trees are planted. In China and Vietnam the trees are not felled at the end of the season, but are tapped following the yojogaki method in which the trunk is tapped the 2 or three times during the collecting season once a year or once every two years. |
