Are they always green?

No! Many greenroofs appear red, orange, yellow and all colours in between at different times of the year because the fleshy leaves of various succulents change colours throughout the year. Also, greenroof plants are not all evergreen, nor should they be. The beauty and anticipation of the change of seasons add to the colour palette. And of course, flowers vary, too, in colours from whites to yellow, pinks, deep reds and purples and blues. A virtual living carpet or tapestry varies from season to season as plant communities naturally migrate in their random regenerative patterns