Above ground, tile, clay, and impure water make their existence something less than edenic. Moreover, the soil of Taipei is unusually alkaline.
再加上路面上鋪了紅磚、水泥，透水與透氣性均差；且台北的土質是不適行道樹生長的鹼性；道路與各種地下管道的裝修單位，又偶而在底下留下瀝青、磚塊、水泥、石頭… …，更加破壞了土質，抑制樹根的生長。