Greenscape Gardens Green Blog

PRUNING OVERGROWN APPLE TREES

Apple trees that are not pruned for several years will often produce so many branches that little energy is left for fruit production. Overgrown apple trees are also difficult to harvest and spray. Gardeners who who such a tree are often at a loss as how to get it back in shape.

Often the best recommendation for such a tree is to make one pruning cut at ground level and start over with a new tree. But that is a rather drastic measure. However, trees may have sentimental value that will make revitalization worth the time and effort. Realize that this will be a multi-year process because no more than 30 percent of the tree should be removed in one year. Here are some steps to follow:

1. Remove all dead wood. This does not count toward the 30 percent.

2. Remove suckers from the base of the tree.

3. Choose approximately six of the best branches to keep as scaffold branches. Remove all others. Branches should be cut flush to the branch collar. The collar is the natural swelling that occurs where a branch connects to the trunk or to a larger branch. Removing the collar would leave a larger wound that would take additional time to heal. Do not paint wounds. Wounds heal more quickly if left open.

Candidates for removal include branches with narrow crotch angles, which are more likely to break in wind and ice storms, and those that cross branches you will save. This may be all that is possible the first year if the 30 percent threshold has been reached.

4. Thin the branches on each scaffold branch. Remove crowed branches to open up the tree to light and allow moisture to escape. Shorten each scaffold branch by cutting back to a side branch. When you are through, the tree should have enough wood removed so a softball can be thrown through the tree.

Severe pruning often will cause an apple tree to produce vigorous side shoots from the trunk called water sprouts. These should be removed throughout the growing season so the center of the tree stays open.