Roof gardens, green roofs and walls
Many of the interiors of the buildings we have in the city are only used by us humans. That unfortunately means that there are many square meters, which are not being used for anything. These empty spaces could easily be filled with nature. Green roofs and walls are also beneficial in terms of climate adaptation, they help isolate the buildings and they are good tools against flooding from rainwater.
Green roofs and walls are typically grown with species tolerant to darkness, for example stonecrop, which is an excellent source of nectar for butterflies and bees. Ivy covers the walls of many buildings and trees in older cities. Ivy is a climbing tree, which grows by climbing up other surfaces such as walls or trees. As the ivy gets older, it starts to bloom, but unlike other flowers, it occurs in the late autumn (October to mid-winter), where not many other sources of pollen and nectar are available. This is very beneficial for buzzing insects such as bees, bumblebees, buzzing flies and butterflies.