Trees on roofs and in containers face more extreme conditions: the wind levels are higher and the temperatures vary more than at ground level. In containers, the growth space is also very limited and a good substrate with added nutrients and water is indispensable. The location plays an important role on roofs. There are often more possibilities on parking roofs. Due to the stronger construction of parking roofs, they can bear more weight. The situation at ground level makes the wind and temperatures less extreme. Of course the budget for maintenance is important when choosing trees on roofs or in containers. A tree on a roof or in a container lives in unique conditions and requires more maintenance than a tree in open ground.