All fruit trees need to be pruned, and the best time is late winter (March through April). The tree is dormant and the wounds will heal quickly in the spring. Also, the tree is leafless and we can see the branches and their structure easily.
Pruning is needed to keep a tree healthy. This will bring more sunlight and air movement into the canopy, thereby reducing disease problems.
Pruning will keep a tree stronger. Remove the weak branches that cannot support fruit. This will create a structure that can stand up to the winds and blizzards of North Dakota.
Pruning will improve fruit quality. The increased sunlight in the canopy will brighten the fruit. The increased air movement will reduce pest problems, too.
Pruning helps us manage the tree. By keeping the tree low, we can spray (if needed) and harvest the fruit more easily.
On the other hand, unpruned apple trees produce low-quality fruit. Unpruned trees are more susceptible to diseases and storm damage. Unpruned trees are more likely to be attacked by insect pests; no one likes wormy fruit.
The major goal when pruning is to maximize the amount of sunlight and air movement in the canopy.
The most popular structure for fruit trees is the modified central leader. This structure has one major branch in the center and the widest part of the tree at the bottom, with the branches working their way up in a “Christmas tree” shape. To maximize the amount of high-quality fruit, the tree should not be taller than 16 feet.
Pruning a fruit tree is not hard, but you have to take your time, constantly stepping back to make sure you see all of the angles.
Start by taking out the suckers that develop at the base of the trunk.
The basics of pruning fruit trees
Fruit trees, especially apples and pears, have a tendency to develop vertical branches (we call them water sprouts). Water sprouts clutter the tree and do not produce fruit. Remove all the water sprouts.
That was the easy part. Now we have to think a bit. If the tree is 5 years old or younger, it still has time to develop the structure we like to see in healthy fruit trees. Be patient; this may take several years.
If possible, the first branch should begin about 30 inches from the ground. Ideally this branch will face the west or south to shade the trunk from the scalding rays of the winter sun.
In the next 24 inches, we will develop our first series of major “scaffold” branches. Four branches, each facing a different direction (north, south, east and west), would be ideal. Imagine viewing the tree from above. The branches coming out of the trunk should resemble spokes coming out of the hub of a wagon wheel.
Then develop a gap of about 24 inches between the sets of scaffold branches to maximize sunlight and wind movement.
Next, develop the second set of scaffold branches. As the tree grows, you may allow for another 24-inch gap and then a third and final set of scaffold branches. Allow a foot for the leader and you have a perfect tree.
Of course, nothing in nature is that perfect. These are principles only. Maybe you cannot have a gap between the sets of scaffolds; in many cases, you will have more of a steady progression of branches up the tree (keep adjacent branches going in different directions so they do not shade each other).
Look for branches with sturdy angles. Sixty degrees is best (some growers call these 10 o’clock and 2 o’clock branches). Branches with narrower crotches are less fruitful and subject to splitting.
Vertical branches do not produce fruit. Horizontal branches produce fruit but will droop from the weight of the crop. Also, horizontal branches will not generate the vegetative growth we need.
Remember to maximize air movement and sunlight in the canopy. Remove any inward- or downward-facing branches, which create shade pockets.
Remove the weaker of branches that cross over one another. They can rub against one another and create wounds. Remove any broken branches.
Try not to remove more than 25 percent of the tree’s wood during any single year. If your tree has been neglected for a long time, a lot of wood needs to be removed, and getting it in shape will take a few years.
Most fruit growers use a lopping shears and hand pruning shears when pruning. A bypass shears will make cleaner cuts than anvil shears. A pruning saw sometimes is used after the tree is well established to remove large branches.
Never use wound dressings when pruning fruit trees. The wounds will heal faster if you leave them alone.
After the major branch structure is in place, we can develop the secondary branches.
We will make the cuts with our hand pruners, making the cuts just above a bud, allowing for a collar (see Figure 4). This will encourage healing and lead to more outward growth (less cluttering of the canopy). Prune to a bud that faces where you want the branch to grow; usually this is an outward-facing bud.
Don’t leave stubs when pruning. These do not heal well and often lead to disease.
If you are not sure you are done pruning, keep pruning. Open the tree up. Create lots of windows for air and sun. Open up the tree and you will be rewarded with high-quality fruit.
How to prune a small branch