《农桑辑要·蚕事预备·植蚕之利》
还有一个多月的时间可以生长，桑的枝叶生长茂盛，一定会超过往年；所以等到第二年的春天，桑树生叶的时间一定会更早些。
可长月余，其条叶长盛，过于往岁。至来年春，其叶生又早矣。
There is more than a month of growth time, and the branches and leaves of the mulberry tree will grow vigorously, which will definitely exceed previous years; therefore, the mulberry tree will definitely grow leaves earlier in the spring of the following year.