"Low-maintenance sedum cuts energy costs as well as greenhouse gases. Flowers and baby sedum on the flat roof will retain about half the rainwater that falls on it." (CS Monitor) Thanks to Steve G. for the link.
"Low-maintenance sedum cuts energy costs as well as greenhouse gases. Flowers and baby sedum on the flat roof will retain about half the rainwater that falls on it." (CS Monitor) Thanks to Steve G. for the link.