First, the cluster-shaped pruning, most of the osmanthus tree varieties have a cluster of habits, as long as properly pruned, can maintain the physiological balance of reproductive growth and vegetative growth, so that the flowers are flourishing. Osmanthus trees will pick up new shoots every spring and autumn, but they will get the best from spring shoots. The flowers bloomed in the spring when the branches and leaves were planted. Although the branches were also flowered in the next year, the flowers were of poor quality. Therefore, in the autumn, a thinning is needed after the flower is spent, and the long branches that grow in summer and autumn are cut off, leaving strong spring branches. The second pruning should be carried out before the early spring buds are not germinated, and the dead branches, thin branches and diseased branches after winter are cut off. This will not only facilitate ventilation and light transmission, but also concentrate nutrients completely on spring branches and flower buds. Create good conditions for autumn flowering. In addition, in the growing season, the litchi should be repaired at any time to concentrate nutrients, which is conducive to the growth of spring shoots and flower buds.
Second, the solo-shaped pruning, because the sweet-scented osmanthus tree has 2 to 5 clumps of habits, so in the seedling stage, you should choose to leave a branch of the trunk early, when the trunk reaches the expected height, you can pick the top, make it happen 3 to 5 One side branch forms a canopy. The outer branches that grow too dense should be thinned, weakened and strong to strengthen the branches. For the rest of the branches, it should be moderately short, so that the buds take the lead and stimulate the hair. Maintain a strong growth. When branching, the branches should be separated from the apex of the branches by a certain distance, usually 7 to 10 cm. It does not squeeze left and right, does not stack under seven, the branches are not dense, the distribution is even, ventilation and light.
Third, semi-circular spherical trimming, trimming is carried out in early spring every year. When trimming for the first time, according to the size, height and plant shape of the seedlings, the stem is shortened by 1/4~l/3, which causes the lower adventitious bud to sprout new branches and trim the dense branches appropriately. Afterwards, cut off the dead branches, thin branches and diseased branches, and then keep 3 to 5 sites. The internodes are short, and the opening angle is moderate, the branches are evenly distributed in a rounded shape, and the remaining buds are eliminated. In the next year, when the side branches are overgrown, some branches of the base are reserved for flowering branches, and the long part is short-cut, so that it grows in harmony with other side branches, and the long branches growing in summer and autumn are cut off. According to the need to control the height of the plant, combined with topping, timely cut off the protruding branches (probe branches) in the periphery of the canopy to keep the crown neat and complete, forming a good crown structure.
Plastic pruning, especially the heavy pruning measures combined with the comprehensive management of water and fertilizer, has a good regulation and promotion effect on improving the growth of old-aged potted sweet-scented osmanthus trees. It can coordinate the contradiction between potted plant height and greenhouse height. Properly solve the wintering management problem of the northern potted sweet-scented osmanthus trees.
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