Tell me what are the commonly used trees for roof gardens?

Choose short plants with shallow root systems. Tall trees have deep root systems and large crowns. The wind on the roof is strong and can easily be blown down. If the soil layer is thickened, the weight will increase. Moreover, the well-developed root system of trees often penetrates deeply into the waterproof layer, causing leakage. Therefore, roof gardens should generally use plants that are relatively low, have shallow root systems, and are drought-resistant, cold-resistant, and barren-resistant. There are mainly the following categories. Sedum genus: Sedum, Sedum, Sedum, Sedum, etc. Vine cover types: Perennial grasses such as periwinkle and linseed ivy. Flower types: Dianthus, thyme, coreopsis, yarrow, aster and other dwarf shrubs: dwarf crape myrtle, June snow, mallow. , hibiscus, small-leaf fusilla, hibiscus, false forsythia and other shrubs and small trees: white orchid, rose, June snow, pomegranate, red maple, nandina, osmanthus, anise, gardenia, hypericum, hydrangea , cycad, wine bottle orchid, rhododendron, etc.