When is the best grafting time for chestnut trees?

The grafting period varies with the terrain and climatic conditions, and the phenological period should prevail, that is, the grafting is carried out when the rootstock buds germinate without spreading leaves or the temperature stably passes through 10℃. At this time, the temperature rises, the sap flows, the cambium moves, and the grafting survival rate is high. Grafting is too early, callus formation is slow, and time is prolonged at low temperature. During this period, strong wind, drought and even rainy weather will affect the survival rate. If the grafting period is too late, the rootstock will be grafted after its leaves are unfolded, and the temperature is high and it will heal quickly. Although the survival rate is high, the nutrition of rootstock has been consumed a lot when its leaves are unfolded, and the growth after grafting is small. In addition, the growth period is short, and the trees are often weak or even dead. Therefore, the best time for grafting seedling of chestnut is the first half of April, when rootstocks and scions are full of vitality. Temperature 10 ~ 20℃, humidity above 80%. If you choose sunny days for grafting, the survival rate is high, the seedling growth period is strong, the seedling raising rate is high and the economic benefit is good.