In principle, trees should be planted in the dormant period of seedlings, usually in spring and autumn. It is most suitable to plant trees in spring, because during this period, trees are in a dormant period before germination, have not yet taken root and sprouted, have slow response to environmental conditions such as temperature and humidity, have low physiological activity, and can withstand the changeable climate in early spring. If you plant trees in summer because of special needs, you need to pay more attention. The choice of tree species is hot in summer. In order to achieve a higher survival rate, we should not only consider the color, shape and charm of the branches and leaves, but also consider the adaptability of the trees. Based on the above two points, we should pay attention to the following points when choosing tree species in summer: ① Try to choose evergreen tree species. Because evergreen trees grow in different degrees in each season, planting in summer has less influence than deciduous trees and is easy to survive. The selected tree species are boxwood, Ligustrum lucidum, Sabina vulgaris, Platycladus orientalis and pine trees. ② Try to choose shrub species and lobular species. Because compared with trees and broad-leaved trees, they are easy to retain water and are conducive to survival. The available tree species are Buxus, Ligustrum lucidum, Berberis, Amorpha fruticosa, Prunus humilis, Eucommia ulmoides, Hibiscus, etc. Choose native tree species as much as possible. Because native tree species have good adaptability to local soil and climate conditions, they are easy to survive. The native tree species in the north mainly include: willow, locust, Ailanthus altissima, elm, Sophora japonica, Fraxinus mandshurica and so on. Seedling requires perennial seedlings to be robust and free from pests and diseases. Soil ball seedling: When planting trees in summer, bare roots are not easy to survive. Bring soil balls as much as possible when raising seedlings, which can reduce the damage to roots and have a high survival rate. The size of the soil ball is related to the height and diameter of the tree. When transplanting large seedlings, the diameter of soil ball is generally 2 ~ 3 times of the head diameter of the plant. Pruning of trees When planting trees in summer, in order to avoid the imbalance of nutrient supply between the aboveground and underground parts of plants, the branches of the aboveground parts are pruned and some branches and leaves are removed. Pruning in spring is more important than planting trees. In addition, according to the integrity of the soil ball, some stems are cut off or even cut off appropriately, and combined with pruning, shaping and other methods to ensure its survival to the greatest extent. In the process of seedling emergence, some roots may be damaged. The old rotten roots of plants should be cut off, the bare roots should be stained with mud, and then wrapped in wet grass and straw bags. Before planting trees, intensive cultivation should be carried out. The land used for afforestation is often not cultivated land, and it needs to be thoroughly ploughed, with a depth of 40 cm ~ 50 cm, to loosen the soil and increase the ability of storing water and preserving moisture. Be careful in soil preparation, or the tree will not take root and affect its survival. The tree pit should be dug as large as possible, and the size should be one-third larger than the clods of saplings, and the cinder, lime and other sundries in the pit should be removed to facilitate the trees to take root and grow. Before planting trees, some fine soil should be backfilled at the bottom of the pit to help the trees take root. Put the earth ball of the tree into the pit, straighten the tree, and then fill the soil, stepping on it while filling the soil. Don't break the soil ball when filling the soil. The filled soil is higher than the original soil ball. Generally, the maintenance management after planting should be watered at least three times and thoroughly. If it is insufficient, it is necessary to replenish water and pay attention to the cultivation of root soil after watering. And often spray water on trees to reduce the surface temperature of trees and reduce nutrient consumption, which is conducive to survival. Pay attention to the prevention and control of pests and diseases such as aphids, and observe spraying in time. In terms of fertilization, when digging a pit, base fertilizer should be applied at the bottom of the tree pit first; After planting, manure or chemical fertilizer can promote its growth through furrow application or hole fertilization.

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