The time of grafting varies according to the terrain and climatic conditions. The phenological period should be used as the criterion, that is, when the rootstock buds sprout without sprouting, the grafting or the temperature stably passes 10°C. At this time, the temperature rises, sap flows, formation activity, and the survival rate of grafting is high. If the grafting is too early, the temperature is too low for the callus to form slowly and the time lengthens. During this time, a strong wind, drought or continuous rain affects survival rate. If the grafting period is too late, the rootstock is grafted after the leaves are displayed. At this time, the temperature is high and the healing is fast. Although the survival rate is high, the nutrients of the rootstock have been consumed in large amounts at the leaf exhibition, and the growth after grafting is small, and the growth period is short. The tree is often weak and even dead. Therefore, the best time for chestnut grafting is the mid-April period of April, and the rootstock and scions are full of vigor. The temperature is between 10 and 20°C, and the humidity is above 80%. Grafting is preferred in 2 to 3 days. The survival rate is high and seedlings grow. Strong period, high rate of gardening, and good economic returns.
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