Add a green roof for insulation and oxygen.
Greenroof mix. Natural insulation for your house! Propagates naturally, stays green as long as it's kept wet. Has minimal water needs: 20 inches or less per year if well spaced, otherwise sprinkle your roof. Drought tolerant except in desert conditions. Plant 4-6 lb/1000 sq ft. Contains Eureka Hard Fescue, Sheep Fescue, Chewing Fescue, and Creeping Red Fescue.