Photo taken on June 21, 2019 shows a lotus flower at the Zhouji Green Expo Garden in Nantong, east China's Jiangsu Province. (Photo: Xinhua)

Photo taken on June 21, 2019 shows a flower at the Zhouji Green Expo Garden in Nantong, east China's Jiangsu Province. (Photo: Xinhua)

Photo taken on June 21, 2019 shows a cactus plant at the Zhouji Green Expo Garden in Nantong, east China's Jiangsu Province. (Photo: Xinhua)

Photo taken on June 21, 2019 shows a cactus plant at the Zhouji Green Expo Garden in Nantong, east China's Jiangsu Province. (Photo: Xinhua)

Photo taken on June 21, 2019 shows a water lily flower at the Zhouji Green Expo Garden in Nantong, east China's Jiangsu Province. (Photo: Xinhua)

Photo taken on June 21, 2019 shows a lily flower at the Zhouji Green Expo Garden in Nantong, east China's Jiangsu Province. (Photo: Xinhua)