As the world gets more urban and more of us move to cities the plant life of cities has a bigger impact on us all. The diversity of conditions in the city as opposed to the countryside gives us a larger selection of plants in the city. But the plants that can handle the urban environment tend to be very similar to each other. This means changes in climate and other city conditions may have a far greater detrimental impact on urban plants.
More plant species grow in German towns and cities than in the countryside, but those in towns and cities are more closely related and are often functionally similar. This makes urban ecosystems more susceptible to environmental impacts. . .. [ read more Similarity Of Urban Flora: Plants In Towns And Cities Are More Closely Related Than Those In The Countryside]