The Content Of The Article:
- Winter cut: less digestible for most trees
- Summer cut: the benefits outweigh
- Conclusion: Correction cut in summer, maintenance cut in winter
In tree nurseries and also in fruit farms, tree trimming is traditionally carried out in winter - for a very pragmatic reason: during the growing season there is no time for that because there are too many other works to be done. Specialist companies for tree care, however, shift the cutting measures increasingly into the summer months, because this season is cheaper from a biological point of view.
Winter cut: less digestible for most trees
Both deciduous and evergreen trees and bushes minimize their metabolism with sinking temperatures. The result is that in case of bark injuries, the natural defense mechanisms against harmful organisms only work very limited. Although the activity of bacteria and fungi is limited at low temperatures, the likelihood of wound infection is still higher because, for example, the fungal spores have more time to germinate. In addition, the necessary moisture is available in mild winters. In addition, some tree species such as birch, maple and walnut begin to "bleed" very strongly after the winter cut with the new shoot. The leaking juice stream is not life-threatening for the trees, but leads to a loss of substance.
In winter it is often easier to keep track of the average
For the winter section on the other hand argues that you can judge the crown structure better, for example, in fruit trees than in the leafy state. So you can see more quickly which branches and branches have to be removed. In addition, less clippings occur in summer-green shrubs in the leafless state.
But the perceived advantage can also be a disadvantage, because you often misjudge the crown density and remove too much wood in the foliage-free state. This leads to an exaggerated strong renewal, especially in the case of pome fruit, so that in the summer you have to remove a lot of water rice to calm the growth.
Summer cut: the benefits outweigh
It used to be thought that a summer cut weakened the tree more, because it lost a lot of leaf mass due to the care measure. However, this argument has long since been invalidated by science, because the reserve substances stored in the bark are also lost to the plant in the un-leavened state.
The biggest argument for the summer cut is the better wound healing: If a tree stands in the pruning "in the juice", it seals off the injured tissue very quickly against bacteria and wood-destroying fungi. The dividing tissue in the bark on the Astring is activated and forms new cortical cells that cover the open wooden body from the edge. For this reason, crown corrections that cause larger cuts should preferably be made from the beginning of August.
In the summer is to be recommended for all thinner, not too heavily lignified water voyages the ripping. The Astring is also removed and does not form new shoot buds
As a rule, corrective cuts made in the summer are also less radical because you can judge the crown density better and, in case of doubt, prefer to leave a branch longer. In addition, as the growth phase of the trees in summer is already well advanced, they also do not push through as much as after a winter cut - this is the main reason why the very fast growing sweet cherries are now also cut in yield cultivation, preferably after harvesting in summer. In the case of strongly bleeding tree species, the lower juice output also speaks in favor of a pruning in late summer.
One of the biggest disadvantages of the summer cut, however, is the risk of sunburn: If previously shaded branches of the branches are suddenly exposed to the high sun, the bark can be damaged. For this reason, you should first look carefully, where gaps arise when a larger branch is removed, and provided the sunburn prone branches with a white paint. Bird protection is also an important issue in the summer cut, as many garden birds breed several times a year: therefore, carefully search the tree for bird nests before pruning before you reach for the pruning shears.
Conclusion: Correction cut in summer, maintenance cut in winter
All in all, the summer cut outweighs the winter cut's benefits - especially because wound healing starts faster and the trees do not go through so much in the summer. A basic rule, however, is that you should not remove more than a quarter of the crown shoots, while you can cut off up to a third in the winter - but then you have to live with a strong renewal in the spring.Therefore, use the winter especially for the preservation cut in pome fruit such as apples and pears, as this usually does not cause such large cuts. Larger branches, however, should be removed in late summer.
An exception are the conifers: If you want to pin a jaw, for example, the winter is the better season, because the antibacterial resin is then thicker and better closes the cut.