Paredes vivas

Além do autocarro movido a "trabalho de todos os que nele querem andar", encontrei um projeto interessantíssimo: um mapa vivo!

Um grupo de arquitetos idealizou um jardim vertical interior, que representa um mapa:
"The main floor is organized around a continuous 84 ft. long walnut bookshelf designed to precisely match the map of Manhattan. Each edge of the bookshelf denotes a street, with Central Park transformed into a living green wall. Precise attention was paid toward the size and intersection of streets, with smaller parks identified throughout. The main open office space lies directly adjacent to the map-wall, providing ample seating for 60 individuals on continuous custom bamboo desks."

Questão técnica: como farão a manutenção das plantas?