Sewage management in remote rural and mountain areas constitutes a challenge because of the lack of adequate infrastructure and economical capability. Tourism facilities, in particular, possess a special challenge because of huge variability in sewage production and composition as a consequence of variations in number of guests and guest activities. Constructed wetlands (CW) are recognized as a robust and economical ecotechnology capable of meeting these challenges. We established a horizontal subsurface flow CW system at a guest house located in a rural and mountain area of Portugal. The substrate of the bed was an expanded clay substrate, and the system was planted with a polyculture of ornamental flowering plants (Canna flaccida, Zantedeschia aethiopica, Canna indica, Agapanthus africanus and Watsonia borbonica). The load and composition of sewage varied significantly seasonally (e.g. COD 20-1467 mg L-1), but removal efficiencies of BOD and COD were generally high (>90%) and independent on the loading conditions. The system also reduced PO43- (up to 92%), NH4+ (up to 84%) and total coliform bacteria (up to 99%). The ornamental polyculture provided an aesthetic pleasing system with different appearance during the seasons. Of the five species tested, four grew well (Canna flaccida, Canna indica, Zantedeschia aethiopica and Watsonia borbonica), whereas Agapanthus africanus was outcompeted. The system owner cut flowers from the CW system and used them for decorations at the guest house. We demonstrated that CW systems planted with a polyculture of ornamental plant species, besides the water treatment function, possess several additional benefits including aesthetics and biodiversity enhancement.