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Green roofs play a key role in the sustainable development of cities, and creating and increasing green spaces seems to be the most effective solution. Extreme conditions in cities are not conducive to plants. The key issue is the suitability of the species that can be used for this purpose. Due to their wide tolerance and toughness, Sedum species are most commonly used for extensive green roofs. They have a smaller biological product, but with their associated plant surface they are able to provide the expected ecological service even in a particularly thin medium. The performance of green roofs varies depending on the type of vegetation. Studies show that many other perennials are potentially more beneficial than the Sedum species. Of course, these also require more maintenance. Greater use of grasses in roof gardens can have a number of benefits. Grasses, on the other hand, are relatively undemanding, they can be used even in extensive conditions, their heavy metal and drought tolerance is outstanding, and they can withstand the harsh conditions of cities. The deeper medium required by the trees is only available in intense roof garden conditions. Thanks to the grass breeding in Hungary, Hungary has a huge genetic background, which can provide an excellent starting point for the selection of a specifically roof garden variety. In order to have a more efficient, economical and sustainable future, it is important to study and research the plants we use and to expand our knowledge. Thanks to the grassland breeding in Hungary, it has a huge genetic background. This summary will help you review the options, goals, and guidelines for finding the plant species needed for roof gardening.