What are the common trees in the roof garden?

Choose plants with short plants and shallow roots. Tall trees have deep roots and large crowns, but the roof is windy and easy to be blown down by the wind. If the soil layer becomes thicker, it will increase the weight. Moreover, the developed roots of trees are easy to deeply tie the waterproof layer and cause leakage. Therefore, roof gardens should generally choose plants with relatively low roots, drought tolerance, cold tolerance and barren tolerance. There are mainly the following categories. Sedum: Sedum lineatum, Sedum sarmentosum, Sedum dentatum, Sedum aureum, etc. Local lianas: perennial herbs such as Catharanthus roseus and Ivy: short-flowered shrubs such as Dianthus caryophyllus, Thyme, Coreopsis, Aralia, Aster: short-flowered shrubs such as Lagerstroemia indica, Malva, Hibiscus, Buxus microphylla, Fusang and False Forsythia: white orchids, roses and snow.