When and how to prune walnut trees.

Pruning in spring: Pruning in spring is beneficial to relax the tree vigor and promote flowering and fruiting, which is mostly used for young trees.

Autumn pruning: last /9- last/10, half a month from fruit picking to defoliation, autumn pruning is conducive to strengthening tree vigor and promoting mixed bud differentiation.

Summer pruning: long summer-small full (from flower falling time to physiological fruit falling time). Pruning in summer is conducive to flourishing, and it is advisable to prune trees that are flourishing but not fruitful.

Don't prune in winter: Pruning can't be carried out in winter (dormant period), because pruning in winter will cause wounds, easily lead to bleeding, make the tree lose a lot of water and store nutrients, lead to tree weakness, even dead branches, and affect normal growth and fruit.

Pruning method

1, sawing force branch

Some hidden buds of walnut trees are at the base of branches, and some are at the middle and base of branches. Therefore, for the part with bare legs, it is necessary to saw off the hidden buds above the bare legs, go deep into the xylem and force out new branches.

2. Ring saw

For larger non-main branches, the circular saw from the top of the hidden bud to the xylem can not only weaken the growth potential of the branches, but also make the lower part grow branchlets to fill the space of the exposed parts. The effect is similar to that of sawing branches, but it is stronger. Spiral circular saw is safer. Generally, the branches with a diameter of 5- 10 cm are sawed once, 10-65438+.

Step 3: Pinch the branches

Before lignification (June), you can push the new shoots in the inner room to a place with space, because the branches of walnuts are flexible and the leaves are big and thick. Branches with a diameter below 5- 10 cm can be bent downward in summer to open to the required angle without pulling with a stick.

4, thinning branches

Walnut is sparse, so it is advisable to leave an oblique stubble from the inner side of the base to the outer side, so that some branchlets can grow outward to replenish space, and no residual piles can be left, otherwise the piles will die into holes.

Extended data:

1. The male inflorescence of walnut tree is drooping, about 5 ~ 10 cm long and as thin as 15 cm. Bracts, bracteoles and perianth segments of male flowers have glandular hairs; Stamens 6 ~ 30, anthers yellow, glabrous. Female spike usually has 1 ~ 3 (~ 4) female flowers. The involucre of female flowers is short glandular hairy, and the stigma is light green.

2. The fruit sequence of walnut tree is short, with 1 ~ 3 fruits; The fruit is nearly spherical, 4 ~ 6 cm in diameter and hairless; The stone is slightly wrinkled, with two longitudinal edges and a short tip; The diaphragm is thin and there is no gap inside; The endocarp wall has irregular gaps or no gaps, only wrinkles.

References:

Baidu encyclopedia-walnut tree