1. When pruning blueberries in winter, we should adhere to the principle of keeping strong buds, strong branches and strong trees. 2. Pruning in winter can level stubble, that is, for piles close to the ground 1cm-2cm, all the above-ground parts should be cut off. Winter pruning can thin branches, that is, cut off the whole branch at the base of the branch. Pruning in winter can be short, that is, some branches are cut off. 3. The key point of pruning young blueberries in winter is to remove flower buds, and the key point of pruning mature blueberries in winter is to thin branches.

First, how to prune blueberries in winter

1, Pruning principle of blueberry in winter

The principle should be light rather than heavy, and keep the buds strong, branches strong and trees strong.

2. Pruning method of blueberry in winter

(1) stubble leveling

The stubble is close to the ground, that is, the pile 1cm-2cm, and the above-ground part should be cut off as a whole. The key point is to renew and rejuvenate young trees or old trees with extremely weak growth potential within 1-2 years, and the old trees are usually more than 20 years old.

(2) thinning branches

Thinning is to cut off the whole branch from the base of the branch. Thinning mainly includes old branches, weak branches and overlapping branches.

(3) Shortcuts

Short cutting is to cut off a part of branches to stimulate the germination of lateral buds under the incision and promote branching. The main branch is too long or the fruit falls to the ground after fruiting.

Step 3 prune blueberries of different ages

(1) Pruning of Young Blueberry Trees in Winter

When cultivating and managing young trees, it is important to promote root development, expand crown and increase the number of branches. Young trees should be pruned mainly by removing buds. The method is to remove all flower buds by cutting or spreading, so as to promote the germination of branches and expand the crown. Among them, young trees that have been planted for 1-2 years should be pruned until next spring or when the greenhouse heats up. The pruning method is to keep the main branch about 10-25cm, and cut off all other branches. For young trees that have been planted for 2-3 years, the weak branches should be removed, 4-6 main branches should be kept, and appropriate flower buds should be left to control the fruit yield. Generally, 3-year-old trees can choose 50- 100 flower buds, and the yield can be controlled at about 250g, and 4-year-old trees can choose 100-200 flower buds, and the yield can be controlled at about 1kg.

(2) Pruning mature blueberry trees in winter

Mature trees should be sparse, and enough flower buds should be left for robust trees to bear fruit. Mainly remove short branches, weak branches, pests and diseases, and do a good job in cultivating branches, enhancing tree potential and controlling plant height.

Second, why do you want to trim?

Blueberries belong to perennial shrubs of Vaccinium in Ericaceae. If you don't prune, there will be more and smaller fruits, later ripening, poor fruit quality and fewer new branches, and the yield will be lower next year. If the pruning is too heavy, the fruit will be less and the yield will drop sharply. Only reasonable pruning can achieve the balance between fruit yield and quality, make early maturity and high yield come true, and prolong fruit life.