It takes about 2 months for Tilia amurensis leaves to turn yellow and fall off. Tilia amurensis is a deciduous tree, which is mainly distributed in Changbai Mountain and Wandashan Mountain in China. It is a high-quality wild nectar source plant. Every year from mid-June to mid-July, Tilia amurensis blooms, and the forest is filled with rich fragrance. Tilia amurensis flowers are very small. Each flower consists of five petals and five stigmas, with bright flowers in the middle.