In summer, healthy trees can start sealing off wounds from pruning cuts while continuing to put out leaves and make energy from sunlight. But if the tree is struggling with heat stress, summer pruning may be too damaging. The best time to prune is in early summer before temperatures have reached their peak.
Spring flowering trees should be pruned after flowers have dropped. To avoid the introduction of disease pathogens to oaks and elms, avoid pruning between April 15 and October 15. Prompt pruning of storm-damaged limbs and dead branches should be done to encourage wound closure and avoid potential hazards.
Aim for the end of July to mid August. The reason you Summer prune is to restrict growth (after all an espalier is a restricted form) and to let in light to help the fruit ripen. The light also encourages buds for the following season, so everyone's a winner!
Pruning during the growing season always stimulates new growth. During summer's heat, having to produce that ill-timed new flush of growth greatly stresses a tree. Pruning in the fall is even worse as it prevents the tree from going into a natural dormancy. The exception is heavily damaged, disease or dead wood.
Oaks are definitely one tree to refrain from pruning in the summer due to oak wilt. Most trees should be fine, as others have said, it might just cause undue stress.
Trees that Benefit from Summer Pruning
Some people prefer a summertime prune for these trees because they typically ooze sap when pruned in winter and early spring. Trees with dead branches: If you spot dead, broken, or dying limbs, you can remove those at any time.
Oak wilt is most active from April to July, which is why you should never trim oak trees in the summer. To be safe, you should avoid pruning between April 1 and November 15. Davey arborists recommend pruning oak trees between November 15 and March 31.
Generally, pruning trees in the summer is not recommended. During the summer months, most trees are still very active and growing. Trimming during this time could discourage new growth for the next season. Ideally, the season when you should prune trees is winter, when the tree is dormant.
Some bad pruning examples include: Stub Cuts: These cuts leave a branch stub that prevents the tree from sealing the wound to protect it from diseases. If you can hang something off the end of a branch, it's an incorrect pruning cut.
Make proper cuts to insure the health and longevity of your plants. Use the three-cut method when removing large branches. This prevents trunk damage caused by the weight of the branch ripping it and the bark off the tree. Make your first cut about one foot away from the trunk.
Pruning in the summer is primarily for shaping and creating a solid structure. Heavy pruning should be saved for winter when trees are under less stress. Moreover, it is important to do your summer pruning earlier in the season. If you wait too long, you could put the tree at risk of water damage or winter injury.
Pruning in autumn and winter could potentially damage the plant, as it can unbalance the root to shoot ratio during a period when it is too cold to regrow. The best time to prune is after flowering.
Generally, the best time to prune or trim trees and shrubs is during the winter months. From November through March, most trees are dormant which makes it the ideal time for the following reasons: Trees are less susceptible to insects or disease.
The branch bark ridge is the dark, rough bark ridge that separates the branch from the main branch or trunk. Pruning just beyond the branch collar and branch bark ridge retains the tree's natural defense mechanisms and promotes compartmentalization and callus formation. Do not make flush cuts when pruning trees.
Tree pruning involves the removal of live branches, as well as dead, diseased, and damaged branches for the health of the tree, while tree trimming only involves the removal of branches that interfere in some way.
Properly pruning a tree limb
With that in mind, cut limbs ¼ inch above a bud that faces the outside of the plant. This will be the direction of the new growth. Keep your cuts at a 45-degree angle to prevent water damage and disease.
The 1/3 rule for pruning shrubs refers to the practice of cutting about 1/3 of wood or a branch. This approach is applied to fully established shrubs and small trees. This is done at this stage since the established shrubs and plants are past their transplant shock.
How much can you trim off a tree without killing it? You don't want to remove more than 25% of the foliage from a tree in a single year. Removing too much foliage or too many branches at once could damage your tree beyond repair.
PRUNING: Generally it is safe to prune most trees in mid-summer, from roughly mid-July to mid-August to be more specific. However, you may want to pause pruning during an extreme heat event, including right before and right after an extreme event, so consult the weather forecast as part of your pruning plan.
Late Summer Pruning (August-September) Few plants are pruned this time of year because pruning encourages new growth that does not have time to harden off before winter.
Remember: pruning trees in spring can leave them more vulnerable to insect infestation and diseases. That's why you don't want to prune these trees in spring, summer, or early fall: Oak trees to reduce the chance of oak wilt (if oak wilt is in your area) Elm trees to reduce the chance of Dutch elm disease.
Contrary to what many homeowners assume, summer is the worst time of year to cut off oak branches. Instead, it's best to prune from late fall to early spring—November 1 to March 31, to be precise. These are the months when oak trees are less vulnerable to disease and infestations.
If you feel sealing tree wounds is necessary, please look for organic products that include ingredients like collagen or aloe gel as their main ingredient. Other sealants contain ingredients like latex, petroleum, and asphalt. While these products are effective, they have no nutritional value for the tree.
Pruning mature oak trees at home is best kept to the smaller, lower branches that need pruning. Any branches up high in the tree should be left to a professional to cut.