![](http://www.ecns.cn/hd/2020/05/14/89b5f952066e44138485eb6b5e8d89fc.jpg)
Sedum lineare, a kind of tough evergreen succulents are seen planted on rooftops of student dormitory buildings at Zhengzhou Sias University in Zhengzhou, Central China’s Henan province. (Photo: China News Service/ Zheng Yan)
![](http://www.ecns.cn/hd/2020/05/14/983d09d4a15b4118b3908b4d582ed469.jpg)
Sedum lineare, a kind of tough evergreen succulents are seen planted on rooftops of student dormitory buildings at Zhengzhou Sias University in Zhengzhou, Central China’s Henan province. (Photo: China News Service/ Zheng Yan)
![](http://www.ecns.cn/hd/2020/05/14/9e48ea2a025340d6a51786f58f7f21c4.jpg)
Sedum lineare, a kind of tough evergreen succulents are seen planted on rooftops of student dormitory buildings at Zhengzhou Sias University in Zhengzhou, Central China’s Henan province. (Photo: China News Service/ Zheng Yan)
![](http://www.ecns.cn/hd/2020/05/14/038662280a9345d0b106aa0a09fbd3b8.jpg)
Sedum lineare, a kind of tough evergreen succulents are seen planted on rooftops of student dormitory buildings at Zhengzhou Sias University in Zhengzhou, Central China’s Henan province. (Photo: China News Service/ Zheng Yan)
![](http://www.ecns.cn/hd/2020/05/14/21da2ca9d34341829147a0ebabdfb42c.jpg)
Sedum lineare, a kind of tough evergreen succulents are seen planted on rooftops of student dormitory buildings at Zhengzhou Sias University in Zhengzhou, Central China’s Henan province. (Photo: China News Service/ Zheng Yan)