First, for the light roof with weak bearing capacity and no greening design in advance, carpet greening with dense planting of grass seeds suitable for the growth of a small amount of planting soil is adopted, and various ground cover plants are planted in carpet greening. If patterning is adopted, the effect will be better. For example, Shanghai Academy of Agricultural Sciences has successfully researched the "One-step Roof Greening Technology" which is suitable for light flat roof greening. This technology has won the national intellectual property patent and passed the certification of Shanghai High-tech Transformation Project. It has an application area of more than 5, square meters in Shanghai and Beijing, and it is the largest promotion project for roof greening in Shanghai and Beijing. This technology selects Sedum lineatum of Sedum family, which is characterized by fleshy, short, creeping growth, branches on nodes, self-propagation, extremely drought-resistant, cold-resistant and barren-resistant, green in winter fades without dying, and returns to green in spring, saving water and labor, and hardly needing management. Lawn blocks cultivated in the base with 2 ~ 3 cm thick matrix materials can be planted on the roof at one time. Compared with the roof treatment methods such as painting, laying plastic board (mat) and changing flat slope, the cost is lower. Experts and media say this Sedum plant is the best plant for roof greening at present.
Second, for the roof with strong bearing capacity, garden-style greening with trees and shrubs is planted. This method is suitable for the roof with large area, mostly used in high-class hotels, guesthouses and high-rise buildings, which makes the roof space change more and produces rich and colorful effects. For example, a roof garden on the east side of Hangzhou Wulin Square is built on the top of two three-story buildings connected by arch bridges, with a football field and more than 5 kinds of flowers and trees planted in it, which are like spring all the year round.
thirdly, it is combined, that is, it is placed freely, and the roof greening is mainly arranged in the four corners of the roof and by the load-bearing wall, which is more flexible. Which method to choose depends on the load of the roof, the position of the load-bearing wall, the flow of people, the surrounding environment, the use and so on. Scaffolding greening is used to plant vines, such as grapes and kiwifruit, because the cultivation substrate and scaffolding columns can be placed on the load-bearing wall, and the scaffolding and plants have less load. This greening method has less load on the roof, which can be borne by ordinary roof structures, and is especially suitable for the roof of the low podium in front of high-rise buildings. For example, sweet potatoes, peppers and flowers are planted on the roofs of some buildings in Chongqing; Some roofs in Chengdu have not only planted flowers, but also built nurseries, medicine nurseries and melon gardens. The green area of their roofs has exceeded 1, square meters, and there are hundreds of roof gardens, with a larger garden area of 2, square meters.
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