Used for densely planting trees or shrubs to form a fence-like whole. A green hedge with hedgerow plants is called a hedge or hedge wall. Hedges can be divided into two categories: complete forms and incomplete forms; According to its main characteristics, it can also be divided into ordinary hedges, barbed hedges and colored hedges; According to their different heights, they can be divided into short hedges (below 0.5m high), middle hedges (0.5 ~1.2m high), high hedges (01.2 ~ 2.0m high) and green walls (above 2m high).

Hedges have the functions of separating space, blocking sight, reducing noise, beautifying the environment and serving as the background of fountains or statues in gardens. Hedges are often used as decorations or patterns for lawns and flower beds; The middle guardrail is often used in street green spaces, road intersections, or planted in parks, boulevards, car barriers, streets and buildings; High fences and green walls are often used to separate spaces, barrier gables, toilets and other places that should not be exposed.

The planting density of hedge plants depends on the purpose of use, tree species and environmental conditions. Hedge spacing is about 15 ~ 30cm, row spacing is 20 ~ 40cm, and width is about 30 ~ 60cm. Hedge spacing is about 60 ~ 150 cm, row spacing is about 100 ~ 150 cm and width is 150 ~ 250 cm. For hedgerows with more than two rows, plants should be planted in zigzag. Conventional hedges must be trimmed several times a year. In order to fill the base of the hedge with light and lush branches and leaves, its cross section is often cut into trapezoid, semicircle or rectangle. The number of pruning varies with the growth and position of tree species.