He also installed some 250 orchids of 46 varieties together with about 2,000 maidenhair ferns beside Gate 4. To allow the plants to properly photosynthesize, Blanc also installed four grow lights on the ceiling to provide eight hours of light per day.
為了讓植物行光合作用，屋頂還架上 4 盞植物燈，每天提供 8 小時光照。