Photo taken on May 21, 2021 shows an exhibit displayed at the 10th China Flower Expo in Chongming District, east China's Shanghai. The 10th China Flower Expo, which covers a total area of 589 hectares, kicked off here on Friday and is expected to conclude on July 2. (Xinhua/Ding Ting)

Photo taken on May 21, 2021 shows a corner of the Gansu garden of the 10th China Flower Expo in Chongming District, east China's Shanghai. The 10th China Flower Expo, which covers a total area of 589 hectares, kicked off here on Friday and is expected to conclude on July 2. (Xinhua/Ding Ting)

Aerial photo taken on May 20, 2021 shows an overview of one of the main pavilions of the 10th China Flower Expo in Chongming District, east China's Shanghai. The 10th China Flower Expo, which covers a total area of 589 hectares, kicked off here on Friday and is expected to conclude on July 2. (Xinhua/Ding Ting)

Photo taken on May 21, 2021 shows a corner of the Zhejiang garden of the 10th China Flower Expo in Chongming District, east China's Shanghai. The 10th China Flower Expo, which covers a total area of 589 hectares, kicked off here on Friday and is expected to conclude on July 2. (Xinhua/Ding Ting)

Photo taken on May 21, 2021 shows a corner of the Guangxi garden of the 10th China Flower Expo in Chongming District, east China's Shanghai. The 10th China Flower Expo, which covers a total area of 589 hectares, kicked off here on Friday and is expected to conclude on July 2. (Xinhua/Ding Ting)