Fraxinus mandshurica is tall and straight, with lush foliage and dark green leaves. When it enters autumn leaves, it turns yellow, and the fruit is like a paddle, which is quite ornamental. It can be used as ornamental trees, street trees, autumn leaves trees, dike trees and factory greening trees in landscaping.
Fraxinus mandshurica is a deciduous tree with a height of 15m.
The crown is oval, the stem is straight, the bark is yellow-brown, the branchlets are gray-green, smooth and hairless.
Leaves opposite, odd pinnate compound leaves, 5-9 leaflets, mostly 7 leaflets, petiole sessile or short, ovoid or elliptic ovoid, apex tapering, base broadly wedge-shaped, edge with blunt teeth, dark green hairless surface, pale back, pubescent veins, swollen petiole base and yellow autumn leaves.
Panicle terminal or lateral on annual branches.
Flowers without petals, samara oblanceolate.
The flowering period is April-May and the fruiting period is July-September.
Beijing ash is fond of light, but slightly resistant to shade.
Like warm and humid climate, cold and drought-tolerant.
Not strict with soil, like calcareous soil, but it can also grow on acidic soil and neutral soil.
Ash tree is dry and weak in stratification, but it has strong germination and tillering ability and is resistant to pruning.
Deep roots, fast growth and long life, up to 200 years.
Fraxinus mandshurica usually adopts a multi-headed stem-shaped plastic way.
In seedling stage, attention should be paid to cultivating straight stems and retaining auxiliary branches, but it is not advisable to leave too many branches and not too high at the initial stage to ensure the growth of terminal buds and avoid excessive growth of branches or bending of trunk.
After planting, according to different needs, the plants are cut off, and the stem height is between 1.0 ~ 2.0 meters.
After entering the growing season, plants will sprout 2 ~ 4 main branches from the main cuttings. When the length of the main branch exceeds 10 ~ 15 cm, the main branch is cut short, and then the side branch is cut short after the main branch branches, so that it can be shaped after 3 ~ 4 pruning.
After molding, it is mainly to sort out miscellaneous branches, which is relatively sparse.
For modeling needs, some annual branches can also be cut short, but the cut branches should not be used more.
Plastic trimming time is in winter.
Pruned ash trees have dense branches and leaves, like deliberately carved lanterns.
Ash trees with straight trunks can also be used as street trees.
The tree shape can be Gao Qian's natural heart shape and the trunk is sparse, with a fixed trunk height of 3.0 meters. ..
Naturally, there are 3 ~ 5 branches on the trunk, and 2 ~ 3 side branches on each main branch; The trunk is sparse, with 5 ~ 7 main branches, which are born on the central trunk in three layers.
Newly planted Fraxinus mandshurica trees should be pruned in winter and summer 2 ~ 3 years before planting, in order to cultivate large branches and expand the crown as soon as possible.
Select the branches with strong growth, suitable direction, suitable angle and ideal position as the main branches of culture, and erase all the buds below the main branches.
Prune in winter and cut the main branches short.
Keep the stout main branches long and the slender main branches short.
Then cut off the whorled branches, clustered branches, weak branches, diseased branches, over-dense branches and dead branches.
After 4 ~ 5 years of pruning, the trunk is quite tall and strong, so you can stop pruning and let it grow naturally.
Perennial trees should pay attention to retraction, renewal and rejuvenation.