A Biodiverse installation is all about habitat creation. Typically called a Nature Roof, it can involve using varied depths of substrate essentially for spiders, a wide variety of planting for nectar loving insects and habitat incidentals including log piles to provide a home for beetles and other invertebrates.
A typical extensive Sedum or grass roof is relatively low in ecological value although attractive to bees in the Summer, but a 'true' biodiverse roof has a lot more besides, with the emphasis on attracting nature to the urban realm. A mature Nature Roof looks just like a flowering meadow bristling with life. A certain level of biodiversity can be achieved, though less easily, on an external living wall.
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