1. Pop-up irrigation. The cool water coming from above (rather than below as with the drip in the previous edition) will help cool all layers of the growing medium.
|Photo from Sept. 19|
2. Light-colored mulch. We used a "rose" colored, 3/8" pea gravel spread 1" deep all over the roof. This lighter color will help prevent so much absorption and look/act more like a native prairie with their light-colored soils.
|You can see the difference in color between the tan pea gravel (right and top of image) and the darker growing medium (left of image)|
Written by Brenna Marsicek, UW Biodiversity Institute