One does not merely 'put' landscape plants on a roof unless those plants have been modeled to show potential survival success.
We've discussed C3, C4 and CAM principles in previous articles. I now see a major trend towards the development and use of C4 plants in world agriculture.
Plants with C4 photosynthesis processes are now the focus of bioengineering efforts of the worlds foremost plant industry experts.
|Brown, dead Poeaceae C3 species and green, alive Alliaceae C4 species subjected to 48 hr. 1.75 M/S winds|
The photo here is of a trial green roof panel, removed from the roof after being subjected to 48 hours of low humidity (approximately 40% relative humidity water vapor) 1.75 meter per second winds, and approximately 12 degrees C average temperature.
Too many times we in the green roof industry have focused on stone and soil media, plastics and drainage, pumped up additional irrigation and added more and more fertilizers when all we really needed to do is put the right plant in the right place.
Green Roofs should really be about the plants and biodiversity.