The first green roof terrace in the river cruise industry was installed on the Crystal Mozart, owned by Crystal Cruises. Sailing along the Danube River between Germany, Austria, Switzerland, and Hungary, passengers on the riverboat can now enjoy the living garden, installed by ANS Global and AD Associates. Installation took only three days to complete. The roof is made up of multiple individual ANS Grufekit greenroof modules, each containing everything needed, from a water reservoir and drainage layer to the soil and vegetation. The tiles clip together to make the system lightweight and easy to install. ANS Global planted alpine species of plants such as Erica, a low-growing evergreen shrub; and herbs such as Goldmoss stonecrop, a tufted perennial that forms mat-like stands.