Visitors view the rosa chinensis at the Guozhuang scenic area by the West Lake in Hangzhou, east China's Zhejiang Province, May 5, 2020. A rosa chinensis flower show was open to public during the Labor Day holiday in Hangzhou, displaying more than 700 species of rosa chinensis flowers from home and abroad. (Xinhua/Weng Xinyang)

A visitor takes photos of the rosa chinensis at the Guozhuang scenic area by the West Lake in Hangzhou, east China's Zhejiang Province, May 5, 2020. A rosa chinensis flower show was open to public during the Labor Day holiday in Hangzhou, displaying more than 700 species of rosa chinensis flowers from home and abroad. (Xinhua/Weng Xinyang)

A visitor poses with the rosa chinensis at the Guozhuang scenic area by the West Lake in Hangzhou, east China's Zhejiang Province, May 5, 2020. A rosa chinensis flower show was open to public during the Labor Day holiday in Hangzhou, displaying more than 700 species of rosa chinensis flowers from home and abroad. (Xinhua/Weng Xinyang)

Visitors view the rosa chinensis at the Guozhuang scenic area by the West Lake in Hangzhou, east China's Zhejiang Province, May 5, 2020. A rosa chinensis flower show was open to public during the Labor Day holiday in Hangzhou, displaying more than 700 species of rosa chinensis flowers from home and abroad. (Xinhua/Weng Xinyang)