I. Classification according to the growth types of trees
1. Trees
The tree is tall (usually more than 5m) with obvious tall trunk. It can also be divided into trees (more than 20m) according to tree height, such as Pinus tabulaeformis, Picea, Populus tomentosa, etc. Medium-sized trees (height11~ 20m), such as Sophora japonica, Salix matsudana and Koelreuteria paniculata; Small trees (6 ~10m), such as Prunus armeniaca, cherry blossom, red leaf plum, etc. Can also be divided into fast-growing trees according to the growth rate, such as poplar, willow, paulownia and so on; Medium-speed trees, such as Luan trees and persimmon trees; Slow-growing trees, such as Pinus tabulaeformis and Ginkgo biloba.
2. Shrubs
Trees are short (usually less than 6m), with low trunk, no obvious trunk or very short trunk, such as Sabina vulgaris, Rose, Gemwood, Chimonanthus praecox, Peony and Bauhinia.
The above trees and shrubs can be divided into evergreen trees and deciduous trees according to whether they are deciduous or not; According to the type of leaves, it can be divided into coniferous trees and broad-leaved trees.
3. Arboretum
The trees are short and the stems are mostly born from the ground without obvious trunk, such as rose, yellow thorn rose, ditang and forsythia.
4. rattan wood
Woody plants that can entangle or cling to other things and grow upwards. Climb to other objects (such as wisteria) with the help of sucker (such as Parthenocissus tricuspidata), adsorption root (such as Lingxiao), tendrils (such as grapes), vines (such as roses, vines, etc.) and the entanglement of stem itself.
5. Creeping class
The trunk and branches all grow creeping, and adventitious roots can grow in the contact part with the ground to expand the area, such as spreading cypress.
Second, according to the ornamental characteristics of trees.
1. View tree trees
That is, wood, such as cedar, Chinese pine, Sophora japonica, juniper and so on.
2. foliage trees
That is, leafy trees, such as cotinus coggygria, red plum, ginkgo, aesculus chinensis, Ilex cornuta, Acer truncatum, Liriodendron and so on.
3. Ornamental trees
That is, flowers and trees, such as magnolia, peony, elm leaf plum, forsythia, rose, hibiscus, crape myrtle and so on.
4. Fruit trees
That is, fruit trees, such as water chestnut, pyracantha, precious wood, persimmon, hawthorn, Callicarpa, Ilex cornuta and so on.
5. Watch the branches and trees
That is, dry branches, such as Pinus bungeana, Ramulus Morindae, Prunus davidiana, Euonymus japonicus, weeping willow with golden thread, Sophora japonica with golden branches, etc.
6. Root-rewarding tree trunks
That is, root wood, such as banyan.
Three, according to the classification of landscaping purposes
1. Garden trees
Also known as individual trees, solitary trees, shape trees, landscape trees, etc., it refers to trees planted in gardens, courtyards, green spaces, parks, squares, etc., as local central scenery, to enjoy their tree shape or posture, and also to enjoy their flowers, fruits and leaf color (shape). Such as cedar, cypress, purple plum, Chinese pine, magnolia, ginkgo, mountain peach, begonia and so on.
2. Court shade trees
It refers to the trees planted in gardens, courtyards and parks with the main purpose of taking shade. Generally, most of them are deciduous trees with large crowns and thick shades, which shed their leaves when people need sunshine in winter. Such as weeping willows, sycamore trees, Luan trees, Sophora japonica trees, phoenix trees, etc.
3. Street trees
It is a tree planted on both sides of the road to shade vehicles and pedestrians and can form a street, such as Sophora japonica, Luan tree, ash, ginkgo, weeping willow, paulownia, Toona sinensis and so on.
4. Forests
That is to say, in the range of more than 200m in length and 20 ~ 50 m in width, more than 3 rows of trees are planted, that is, forest belts or patch forests are formed, and commonly used tree species such as Populus tomentosa, Robinia pseudoacacia, Luanshu, Acer mono, Fraxinus ash, etc.
5. flowering shrubs
Usually refers to shrubs with beautiful and fragrant flowers or colorful fruits, such as forsythia suspensa, Prunus mume, Rosa rugosa, Pearl Plum, Hibiscus, Peony, Callicarpa Callicarpa, Peach, Rosa roxburghii and so on.
6. rattan
It is a woody vine with slender stems and vines, which can climb or hang on various supports, and some can be directly adsorbed on vertical walls, occupying little or no land area, and its application forms are flexible and diverse. It is a good material for greening scaffolding, flower galleries, dead trees, walls, fences, arches, rocks and slopes, such as Lingxiao, Parthenocissus tricuspidata, American Parthenocissus, wisteria, honeysuckle, etc.
7. Hedgerow plants
It is densely planted in rows (single or double rows) and trimmed into a certain shape, which mainly plays the role of scope and prevention, and can also be used to separate the space or screen the line of sight, such as Buxus macrophylla, Buxus japonica, Sabina vulgaris, Platycladus orientalis, Ligustrum microphylla, Berberis rubra and so on.
8. Ground cover plants
Refers to the low, creeping woody plants used for greening and covering the bare ground or slope, such as spreading cypress, trachelospermum, ivy, Euonymus fortunei, Parthenocissus tricuspidata, American Parthenocissus, etc.
9. Protective trees
It refers to the tree species with strong resistance to smoke and harmful gases, and some of them can absorb some harmful gases to purify the air, which are suitable for greening in factories and mining areas, such as Ailanthus altissima, Broussonetia papyrifera, Sophora japonica, Buxus macrophylla, Sabina vulgaris, Platycladus orientalis, Albizia Albizzia, Pinus bungeana, Amorpha fruticosa, Hibiscus, etc.
10. Potted pile landscapes
Trees suitable for potted plants or making bonsai, such as Pinus pentaphylla, Ulmus pumila, Ficus microcarpa, Pyracantha fortunei, Ilex cornuta, Ginkgo biloba, Osmanthus fragrans, mosquito mother tree, grape, In the snow, Podocarpus, etc.