Tourists visit the Chongqing Garden during Beijing International Horticultural Exhibition in Beijing, capital of China, June 13, 2019. (Xinhua/Ren Chao)

Tourists are seen at the entrance of the Chongqing Garden during Beijing International Horticultural Exhibition in Beijing, capital of China, June 13, 2019. (Xinhua/Ren Chao)

Tourists visit the Hainan Garden during Beijing International Horticultural Exhibition in Beijing, capital of China, June 13, 2019. (Xinhua/Ren Chao)

Tourists visit the Hainan Garden during Beijing International Horticultural Exhibition in Beijing, capital of China, June 13, 2019. (Xinhua/Ren Chao)