When are the red leaves in Xiangshan red?

The red leaves in Xiangshan, Beijing won't be red until the beginning of June 23rd, after the frost solar term. 10. The annual Red Leaf Festival also begins with the first frost, and the best viewing period of red leaves is from the end of June to June 10.

Every autumn in Xiangshan, Beijing, cotinus coggygria leaves are as red as flames and deep purple after frost. These cotinus coggygria trees were planted during the Qianlong period of the Qing Dynasty. After more than 200 years' development, the Cotinus coggygria forest area with 94,000 plants has gradually formed.

The degree to which maple leaves turn red is related to time, drought, pollution, especially nitrogen deficiency. The red maple leaves are actually the result of maple trees responding to natural pressure. The red reaction actually acts as a sunscreen. It makes the maple leaf stay on the tree for a longer time and makes the tree absorb more nutrients. It is found that the pressure of nutrition, especially the lack of nitrogen, makes the maple leaves turn red earlier and more thoroughly.