Trees must be suitable for the soil of a given area, be attractive, resistant to pollution and disease, and not have an overabundance of foliage which will require constant care.
與我們同樣有颱風的新加坡，路樹也種在樹穴裡，但他們路面上鋪的是透水磚，且磚塊間留有不少空隙，對土質的維護也比我們好。