How long will Tianjin afforest Robinia pseudoacacia?

165438+ October. According to the query of the cultivation and planting network, the mucus dropped by Sophora japonica may be gum, which will be more serious in April and May every summer, because the summer weather is hot and the trees themselves are hot, and a large amount of liquid, namely gum, will evaporate to June 165438+ 10. When trees are injured or damaged, trees secrete gum to protect themselves.