What green seedlings are suitable for planting in Xi 'an?

1.？ According to the ornamental characteristics of plants

There are many kinds of garden trees, each of which has its own unique beautiful characteristics, such as shape, color and charm. According to the ornamental value of various trees, they can be divided into the following categories:

(1) Enjoy trees and trees

In the configuration of landscape greening, tree shape is one of the basic elements of landscape construction. Trees with different shapes can produce artistic landscaping effects such as rhythm and layering after proper configuration and arrangement. In general,

(1) spire, cone: This kind of tree species has a solemn and dignified effect, and is generally used in the center of the lobby of buildings, the center and sides of squares, and the sides of major tall buildings. Such as cedar, juniper, arborvitae, cypress and poplar.

②? Round and blunt, bell-shaped: this kind of tree species has a magnificent effect and can be planted on lawns, forest edges and hillsides. Because of its large crown and thick shade, it can be used as a palace shade tree and street tree. Such as locust tree, five-pointed maple, beech tree, acacia tree and so on. ;

(3) Vertical branch type: This kind of tree species often forms an elegant and peaceful atmosphere, and is generally arranged in one-to-one rows because of its beautiful shape.

Our plants are planted in front of doors, courtyards, buildings or lawns, and on both sides of roads. Such as Sophora japonica, weeping willow, weeping begonia, weeping peach, etc.

(2) Leaf-appreciating trees:

The leaves of garden trees have extremely colorful shapes. Leaves have unique ornamental value because of their different sizes, shapes, textures and colors. For example, the leaves of Aesculus chinensis and Liriodendron chinense are very special. But the most ornamental value is the color of the leaves. The rich and varied leaf colors add beautiful colors to the garden landscape. Mainly can be divided into the following categories:

①? Green leaf tree species: this color is the main color in the garden, and green includes light green, light green, thick green, yellow-green, dark green and bright green. Combining different green trees can form a wonderful sense of color. Thick green is cedar, spruce, Ligustrum lucidum, osmanthus fragrans and so on. The light green ones are Metasequoia glyptostroboides and Magnolia grandiflora.

(2) Tree species with spring leaves: The young leaves of these tree species have obviously different leaf colors in spring. Planting them in front of light gray buildings or dense green trees can produce ornamental effects similar to flowering. For example, the spring leaves of Ailanthus altissima and Acer mono are red, and the spring leaves of Pistacia chinensis are purple.

(3) Autumn-colored leaf trees: The leaf colors of these trees change obviously in autumn, and their application adds bright colors to the lonely late autumn. The autumn leaves such as Liquidambar formosana, Rhus chinensis, Pistacia chinensis, Cotinus coggygria and Sapium sebiferum are red or purplish red; The autumn leaves of Ginkgo biloba, Fraxinus mandshurica, Liriodendron chinense, Yijing and Quercus variabilis are yellow or yellowish brown;

(4) Constant color leaf tree species: The leaf colors of these tree species are different all year round, which enriches the colors in the garden. For example, Berberis purpurea and Prunus purpurea leaves are purple all the year round; The leaves of Sabina vulgaris and Ligustrum lucidum are golden all year round; Acer truncatum leaves are red all year round.

(3)? Flower tree:

The flowers of garden trees have different shapes and sizes, and the colors are ever-changing and endless. These complicated changes have formed different decorative effects. The ornamental value of flowers can be classified from the color and phase of flowers.

1 color; ? The colors of garden plants are ever-changing, and the main colors are as follows:

Safflower: including peach, apricot, cherry blossom, begonia, pomegranate, acacia, crape myrtle, bauhinia and so on.

Yellow flowers: including winter jasmine, forsythia suspensa, golden bell flower, osmanthus fragrans, yellow thorn, Tang Di, Hypericum perforatum and Chimonanthus praecox.

Blue flower series: including wisteria, clove, magnolia, hibiscus, paulownia and so on.

White flowers: including lilac, Osmunda, Ligustrum lucidum, Broussonetia papyrifera, Pearl Plum, Magnolia grandiflora, Spiraea, etc.

②? Flowering period: the overall appearance of flowers or inflorescences planted in the crown becomes flowering period, which can be divided into:

Linear flower pattern: Most of this flower pattern has sparse branches and prominent personality, and the flowers on it are also sparsely arranged in inflorescences. Such as forsythia suspensa and golden bell flower. ;

Flowering period: The total number of flowers or inflorescences in this flowering period is small and scattered in all parts of the crown. Such as pearl plum, Liriodendron, etc.

Cluster flowering: flowers or inflorescences are large and numerous, and the whole tree has a strong sense of flowers. Such as magnolia, magnolia and so on.

Overflowering period: flowers or inflorescences are planted on the surface of the crown, forming an umbrella. Such as paulownia, magnolia grandiflora, aesculus chinensis, Luan tree, etc.

Dense flowering period: flowers or inflorescences are densely wrapped on every branch of the whole tree, so that the crown of the tree forms a whole large flower group with the strongest sense of flowers. Such as elm leaf plum, pyracantha, etc. ;

(4) Ornamental fruit trees:

The fruit of plants not only has high economic value, but also has outstanding beautification function. The color of fruit should be paid attention to in tree species used for garden viewing.

① Red series: poplar, hawthorn, holly, wolfberry, pyracantha, cherry, Broussonetia papyrifera, pomegranate, etc.

② Yellow series: ginkgo, apricot, orange, papaya, begonia, etc.

Blue-purple series: grapes, Mahonia, plums, osmanthus, etc.

(4) Black series: Ligustrum lucidum. Small wax, Ligustrum lucidum. Kalopanax septemlobus, Schizonepeta tenuifolia. Honeysuckle. Wait.

⑤ White series: red rosewood, etc.

2. Classification of plants according to their garden uses

Various garden tree species have different uses in gardens because of their different ornamental characteristics, mainly including the following.

Several categories:

(1) solitary tree

Solitary tree, also known as solitary tree, ornamental tree or solitary tree planting, mainly shows the beauty of the tree's form and can be independently viewed as a landscape. Tree species suitable for solitary viewing generally require trees to be tall and majestic, graceful, distinctive and long-lived. They can be evergreen trees or deciduous trees, and usually choose trees with beautiful flowers, fruits and leaves.

There are Cedar, Pinus tabulaeformis, Pinus bungeana, Magnolia grandiflora, weeping willow, Quercus variabilis and Acer truncatum in Guanzhong area.

Snow pine is tall and beautiful, and it is a world-famous ornamental tree species. The big branches at the lower part of the trunk spread out from near the ground, which are not withered all year round and can form a lush and magnificent crown. It is best to plant it in the center of lawn, the center of building vestibule, the center of square or on both sides of major buildings and at the gate of garden.

Pinus tabulaeformis, with its tall and vigorous trunk and spring-like seasons, is not afraid of ice, snow and cold, symbolizing the indomitable and fearless temperament. Due to the lush canopy, there is a solemn atmosphere. In the garden, many people can make a scene with a plant. However, because the natural environment in Guanzhong area is not suitable for its growth, the landscape effect is not good, and even some plants die.

Pinus bungeana, a unique tree species in China, has a mottled ivory trunk, which is very eye-catching and unique with a green crown. Should be planted alone in the lawn.

Magnolia grandiflora, with thick and shiny leaves, big and fragrant flowers, majestic tree posture and mature aggregate fruit, is very beautiful when bright red seeds crack. It is best to plant it alone on a wide and open lawn.

Weeping willows, with slender branches, soft drooping, dancing with the wind and graceful posture, are very suitable for planting on river banks and lakes, and have been important garden ornamental trees since ancient times.

Quercus variabilis has a straight trunk, wide branches, magnificent crown and shaded by thick shade. It turns orange-brown in autumn and has obvious seasonal changes, which has high ornamental value.

Acer truncatum is a precious foliage tree species with swaying tree shape and beautiful leaves. It is planted on lawns, streams, Chi Pan or decorated between walls, pavilions and rocks, and it looks particularly beautiful against evergreen trees or white walls.

(2)? Listening book

Courtyard shade trees, also known as shade trees, are mainly used to form shade for tourists to enjoy the cool and avoid sun exposure and decoration. In the garden, it is planted on the roadside, beside the pool, in front of the pavilion, or with rock buildings, or scattered in small scenic spots in groups of three or five, forming a layout with natural interest; Regular planting can also be carried out in areas with regular axis layout; Because it is most commonly used in the courtyard of architectural form, it is called the palace shade tree. The selection of tree species should be based on ornamental effect combined with shading function. Many trees with flowers, fruits and leaves can be used as shade trees.

There are Albizia Albizia, Robinia pseudoacacia, Fraxinus, Platanus acerifolia, Pu Shu, Zelkova schneideriana, Catalpa bungeana, Melia azedarach, Liriodendron chinense and persimmon.

Albizia Albizia, with beautiful tree posture and elegant leaf shape, is full of velvet flowers in midsummer, fragrant and colorful, which can form a soft and comfortable atmosphere.

Robinia pseudoacacia, with tall crown, light green leaves and green and white flowers, is very elegant and fragrant.

Fraxinus mandshurica, with straight trunk, lush and bright leaves and orange autumn leaves, is a beautiful shade tree.

Platanus acerifolia, with straight trunk, smooth green bark, large and beautiful leaves, dark green, clean and lovely, is suitable for shading trees in the courtyard and in front of the house.

Pu Shu, with beautiful tree shape, broad crown and rich shade, is the most suitable shade tree.

Beech has beautiful branches and leaves, dense shade and majestic tree shape, and its ornamental value is much higher than that of ordinary elm trees.

Catalpa bungeana, tall and straight, thick and dry, with purple and white flowers, is beautiful and pleasing to the eye, and is suitable for being a palace shade tree.

Azadirachta indica, with beautiful tree shape and beautiful leaf shape, has lavender flowers at the turn of spring and summer, which is quite beautiful, has a faint fragrance and strong resistance, and is suitable for shading trees.

Liriodendron, with regular tree shape, strange leaf shape, yellow-green flowers, beautiful but not bright, and yellow autumn leaves, is a beautiful shade tree, which is most suitable for planting on the lawn in the quiet rest area of the garden.

Persimmon, with beautiful tree shape, large leaves, thick green and shiny, turns red in autumn. After September, many fruits are hung in the shade and are not easy to fall off. 165438+ 10 can still be hung on the branches after defoliation, and the viewing period is long. This is an excellent shade tree.

(3) Street trees

Street trees refer to trees planted beside roads for beautification, shading and protection. The choice of street tree species must first have high resistance to various unfavorable conditions in urban streets. On this basis, the conditions such as large crown, dense shade, early germination, late defoliation and short defoliation duration are required. Flowers and fruits are not easy to pollute the street environment, with strong dryness, pruning resistance, dry skin not afraid of strong light, not easy to take root and tiller, less pests and diseases, long life and deep roots.

Common tree species in Guanzhong area are paulownia, Sophora japonica, Populus alba, Pterocarya stenoptera, Acer truncatum, Aesculus chinensis, Luan tree, willow, Ligustrum lucidum and Ginkgo biloba.

British paulownia, with majestic and regular tree shape, thick shady leaves, broad crown, smooth dry skin, easy reproduction, rapid growth, strong ability to resist smoke and dust, and strong adaptability to urban environment, has the reputation of "king of street trees".

Sophora japonica is a good street tree species with broad crown, lush foliage, long life and resistance to urban environment.

Poplar, with gray trunk and straight ends, is tall and broad, quite majestic, and its large dark green leaves can make a cheerful sound when the breeze blows, giving people a sense of heroism. Very suitable for street trees.

Pterocarya stenoptera has a broad crown, dense branches and leaves, fast growth and strong adaptability, but it is troublesome to clean up the leaves in the late growing season.

Triangle maple, with dense branches and leaves, is shaded in summer and turns dark red when it enters autumn leaves, which is quite beautiful.

Aesculus chinensis has a straight trunk, an open crown, magnificent posture, large and beautiful leaves, good shading effect and white flowers in early summer, which is one of the world-famous ornamental trees.

Luan tree is full of leaves, dense branches and leaves, shady crown, blooming in early autumn, golden and dazzling, followed by reddish lantern-shaped fruits hanging all over the treetops, which is very beautiful.

Willow, with soft green branches and leaves, full crown, easy survival, rapid growth, early leaves and strong adaptability, is suitable for street trees. However, because of the variety of catkins and long flight time, male plants are the main ones.

Ligustrum lucidum has delicate branches and leaves, evergreen seasons and full of white flowers in summer, which is very suitable for urban environment and climate.

Ginkgo biloba, with magnificent trees, beautiful leaves, extremely long life and few pests and diseases, is very suitable for street trees.

(4) Ornamental trees

Trees, shrubs and vines with beautiful flowers or inflorescences and ornamental value in flower shape, color or fragrance are called ornamental trees or flowers and trees. This kind of garden plays a great role and has many uses. Some can be used as single ornamental trees and shade trees, some can be used as street trees, and some can be used as flower hedges or ground cover plants.

There are cherry blossoms, begonia, crape myrtle, bauhinia, clove, magnolia, hibiscus, pearl plum, winter jasmine, forsythia, golden bell flower, osmanthus, yellow thorn, Tang Di, peony, rose and wintersweet.

Cherry blossoms, when they are in full bloom in spring, are full of brilliant trees and layered on top of each other, which are very beautiful. They are excellent flowering trees, but their flowering period is relatively short.

In early spring, it blooms before leaves, and its branches are clustered, bright and beautiful, with double petals and extremely double petals, and its fruit is yellow and fragrant in autumn, so it is a good fruit tree species to enjoy flowers.

Lagerstroemia indica has beautiful posture, smooth and clean trunk and bright colors. It blooms in summer and autumn, and the flowering period is extremely long, lasting from June to September, with bright colors and lush flowers. It is most suitable for planting in courtyards and in front of buildings.

Bauhinia, which blooms in front of leaves in early spring, is gorgeous and lovely, regardless of branches, and should be planted on the edge of gardens, buildings and lawns. Because the leaves have not yet come out when flowering, it is more appropriate to use evergreen pine and cypress seeds in front of foreground or light-colored objects.

Lilac, with dense foliage and beautiful and fragrant flowers, blooms in April. It is often planted in front of buildings, around tea rooms and pavilions, or scattered on both sides of garden roads and lawns.

Magnolia grandiflora is a famous early spring flower in China, with large, white and fragrant flowers. Cluster planting in front of lawn or coniferous trees can form beautiful spring scenery, giving people youth, joy and vitality.

Hibiscus, which blooms in summer and autumn, has a long flowering period and large flowers, and there are varieties and varieties with different colors and patterns. It is an excellent garden flower viewing tree species.

Pearl plum, with beautiful flowers and leaves, has a very long flowering period, and is often used in gardens in summer when there are few flowers.

Forsythia suspensa, with arched branches, blooming leaves in early spring, full of golden branches, gorgeous and lovely, is an excellent early spring flowering shrub, which should be planted in clusters on lawns, corners, rocks, rockeries, roadsides and corners.

Osmanthus fragrans has a straight trunk, a round crown and evergreen seasons. Flowering Mid-Autumn Festival, fragrance wafts in Wan Li. It is often planted on both sides of roads in gardens, including rockeries, lawns, courtyards and other places, and can also be planted in large areas to form osmanthus forests.

Tang Di has beautiful flowers, leaves and branches, which can be planted on hedges, walls, watersides, slopes, forest edges and grass edges.

Peony, with big and beautiful flowers and fragrant colors, has the reputation of "national beauty and fragrance". It is often used as a special garden and arch for landscaping in gardens, and can also be planted in flower stands and flower ponds for viewing, or naturally planted alone or clustered on the edge of rocks and lawns or planted in courtyards.

Roses, with bright colors and long flowering period, are suitable for planting in flower beds, flower borders and foundations, as well as lawns, gardens, courtyards and rockeries.

Chimonanthus praecox, which blooms in the cold month and early spring, is yellow as wax and fragrant. It is a good ornamental in winter and is suitable for planting in front of the house, behind the house and in the corner.

(5)? Fujiki

This class includes all kinds of woody plants such as winding, adsorption, climbing and hooking. Their stems and branches are so slender that it is difficult to stand up on their own. This tree can be used for various forms of scaffolding for rest or decoration in gardens, for vertical greening of buildings and facilities, for climbing lampposts and colonnades, for climbing tall and dead trees with anti-corrosion measures to form the effect of exclusive trees, for hanging on roofs and balconies, and for covering the ground as ground cover plants.

There are Akebia trifoliata, Radix Puerariae, Wisteria, Euonymus fortunei, Celastrus orbiculatus, Grape, Lingxiao, Lingxiao, Honeysuckle and so on.

Akebia trifoliata, with beautiful flowers and leaves, is suitable as a greening material for garden fences and flower stands, or for winding trees and embellishing rocks.

Pueraria lobata is a good ground cover plant because of its strong sex, no choice of soil, rapid growth, strong spreading ability and dense branches and leaves.

Wisteria, with dense branches and leaves, has a strong shading effect. At the beginning of spring, the fruit ears are large and beautiful, and the fragrance is overflowing. It is an excellent material for scaffolding, porches, dead trees and mountain greening.

Euonymus fortunei has bright green leaves, such as red and lovely in autumn, and has strong climbing ability. It is very beautiful to cover the walls, altar edges, rocks or climb on the old trees and lattices in the garden.

Celastrus orbiculatus turns red like autumn leaves, and the bright yellow fruit cracks to reveal the bright red aril, which is quite beautiful. It is often planted in lakes, streams, hillsides, forest margins, rockeries and crevices, and can also be used as scaffolding greening and ground cover materials.

Grape is a good garden trellis plant, which can not only be viewed and shaded, but also be combined with fruit production.

Lingxiao, with colorful branches and leaves, large and gorgeous flowers and long flowering period, is a good greening material for garden scaffolding and flower gates. Very suitable for climbing walls, dead trees and stone walls, dotted in the gaps of rockeries, colorful and more beautiful.

Honeysuckle, with light plants and twining vines, is an aromatic vine with reddish winter leaves and white and yellow flowers, which can be twined around fences, flower stands and flower corridors for vertical greening. Or attached to the rock, climbing on the hillside, used for ground cover, full of natural interest; The flowering period is long and the flowers are fragrant, which is worth opening in midsummer. It is a good material to decorate the summer scenery.

(6)? hedgerow

Hedge, also known as hedge or hedge, mainly plays the role of separating space, covering the site, blocking the line of sight, setting off the scenery, beautifying the environment and protecting the garden. According to the characteristics, it can be divided into flower hedge, fruit hedge, colored leaf hedge, hedge and thorn hedge. According to the height, it can be divided into high hurdles, middle hurdles and low hurdles. According to the morphology, there are overall morphology and natural morphology. The selection conditions of various hedges are different, but the general requirement is that this tree should have strong germination and regeneration ability and strong shade tolerance, and the tree species with slow growth and small leaves are suitable.

Common in Guanzhong area are Pyracantha fortunei, Berberis purpurea, Broussonetia papyrifera, Euphorbia Euphorbia, Buxus macrophylla, Coral Tree, Holly, Amorpha fruticosa, Begonia, Pittosporum, Taiping Flower and Ten Contributions.

Pyracantha fortunei, with lush foliage and dense white flowers in early summer, is often used as a hedge in gardens. For example, when autumn fruits are red into the fire, its branches remain long-lasting, beautiful and lovely, and are resistant to pruning.

Berberis purpurea has thin and prickly branches, dark purple leaves and beautiful red fruits when it matures. It is a good material for viewing leaves, fruits and hedges.

Orange, green and prickly branches, flowers first in spring and leaves later, beautiful yellow fruit in autumn, resistant to pruning, often used as hedgerows or barrier trees in gardens.

The wax is small, the flowers are white, fragrant and resistant to pruning. It is often planted in the garden and can be used as a hedge.

Buxus macrophylla, with dense branches and leaves, evergreen all the year round, light green leaves and mottled leaves, is a beautiful foliage tree species and is often used as a hedge.

Buxus buxus, with its low plants and dense branches and leaves, is an excellent short hedge material, which is most suitable for arranging patterns and flower bed edges.

Coral tree, lush foliage, green all year round, white flowers in spring, bright red fruit in late autumn, like coral, very beautiful. They are usually used as hedges or green walls.

Bone-like structure, dense branches and leaves, strange leaf shape, dark green and bright, such as red fruit in autumn, bright and beautiful after winter, is a good hedge material, can also be used as fruit hedge and thorn hedge.

Holly has dense foliage and evergreen seasons. There are many red fruits in autumn, which are very beautiful after winter and suitable for hedgerows.

Taiping flower, with dense branches and leaves, milky white, fragrant, many flowers and long flowering period, can be used as a natural flower hedge.