How to design a small garden on the roof?

General principle: Choose plants with short plants and shallow roots. Tall trees have deep roots and large crowns, but the roof is windy and the soil layer is too thin, which is 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 vine mulch: Catharanthus roseus, Ivy, etc.

Perennial herbs: Dianthus, Thyme, Coreopsis, Dioscorea, Aster, etc.

Dwarf shrubs: Lagerstroemia indica, Liulixue, Malva, Hibiscus, Buxus microphylla, Hibiscus, Forsythia, etc.

Shrub small trees: white orchid, rose, snow, pomegranate, red maple, nandina, osmanthus fragrans, octagonal golden plate, gardenia, Hypericum, hydrangea, cycad, cymbidium, sundew, etc.