Urban roof garden trays from the study. (IMAGE)

Dartmouth College

Urban roof garden trays from the study.

Caption

A native prickly pear cactus (Opuntia humifusa) on the left, thrives next to non-native horticultural varieties of succulent stonecrop species (Sedum or Phedimus).  

 

Credit

Photo by Bala Chaudhary.

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