
① Thickness of soil layer: Lawns and herbs and flowers can grow shallowly, shrubs are thicker than lawns, and the thickness of trees is higher, sometimes reaching more than 1m.
②Planting bed layout: reasonable layout should be carried out in combination with the roof load-bearing structure.
③ Roof garden planting bed structure: including light culture soil, filter layer, drainage layer and roof waterproof layer.
④ Roof planting bed drainage slope and pipeline drainage system: the drainage slope faces the main drainage channel and water outlet, and the water outlet end of the drainage pipe should be matched with the roof water outlet and maintain a certain slope.

Garden Planting Bed Edge Design
The edge of the high bed can be built with natural stones, bricks, broken tiles, wooden strips, etc., and the flat bed is often bordered with low plants, with a height of 15~20cm.
Planting bed design
The selection of plants requires a comprehensive understanding of the ecological habits of plants, comprehensive consideration of plant height, flowering period, flower color, texture and other characteristics.
Garden Planting Bed Color Design
Color design should skillfully use the color of plants to create space or landscape effects, and then coordinate with the environment and seasons.
Garden Planting Bed Hierarchy Design
The spatial hierarchy of plant configuration is generally divided into three layers: foreground, middle ground, and background.
The main scene should be placed in the position of the middle scene, which often appears in the form of repetition.
The foreground generally chooses creeping plants with dense branches and leaves.
The background is the distant view, and most of them choose tall, spike-shaped or straight-line plants.
The standard layout principle is: the tallest plants are in the back, and the shortest plants are in the front or around. (Don't pay too much attention to the principle, only by breaking properly can there be innovation.)
The background mainly acts as a foil, using the distant view to set off the main scene, and the main scene is composed of the middle scene. Through these three levels, the sense of space of the flower border can be increased.
color design
The color design of plant configuration is mainly divided into three color schemes: monochrome design, similar color design, and complementary color design.
Monochromatic design is used to emphasize a certain color in the environment and in special circumstances, and is generally less used.
Similar color designs are used when emphasizing the color characteristics of the season, such as goose yellow in early spring and golden yellow in autumn, and should be used in harmony with the environment.
Complementary color design is mostly used for local color matching of flower borders, making the colors bright and gorgeous.