Improper pruning cut. A proper pruning cut minimizes the damage done to the tree and allows it to heal quickly. An improper cut like a flush cut (cutting too close to the trunk) or a stub cut (cutting too far from the trunk) can cause irreversible damage to a tree.
Bad pruning cuts, like stub cuts and flush cuts, can make trees vulnerable to pests, diseases, and structural problems. Practices like tree topping and lion tailing harm trees by causing stress, weak growth, and increased storm damage risks.
Snipping the tips of tree branches (stubbing out) is among the most common bad pruning cuts. Since pruning promotes growth, you encourage several new branches to develop by snipping the tip of one branch. Too many new branches can be unhealthy for your tree.
Arborists have a 1/3 rule that suggests the branch you trim back to should be at least 1/3 the diameter of the stem it is attached to.
The first consideration for pruning the canopy of young trees is called the Five D's. These are branches that can and should be removed at transplanting, or at any time as the tree is maturing. The Five D's are any branches that are Dead, Dying, Damaged, Diseased and Deformed.
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.
Branches should be pruned at the branch collar-NOT at mid-branch. Mid-branch pruning, called tipping or topping depending on branch size, is harmful to trees, promotes the growth of weakly attached epicormic sprouts, and can lead to the death of the branch or the tree! Sharp, clean tools make the smoothest cuts.
The closer to the tree's trunk roots are cut, the more significant and harmful the damage will be. The 25% Rule – Never cut roots beyond 25 percent of a tree's total volume. The tree may die or fall as a result of this.
Lion-tailing (stripping)
Topping is cutting branches back to points without any lateral branches where they will become Lion-tailing is a dangerous practice that leaves the branches mostly bare with foliage only at the ends (resembling a lion's tail).
Over pruning and topping can permanently disfigure your trees, or even kill them. Further, a tree's foliage is important for protecting it against excessive sun exposure.
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.
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.
Lions Tailing
It refers to when all the lower and/or interior branches on a tree or large major branch are pruned off except for the ends or top. It makes the branch look like a lions tail where the only fluff is at the end. I most often see this in combination with the trunk cleaning.
Pruning in summer may encourage vigor. In summertime, weak tree growth should be pinched or pruned back about 3 inches from the end of each soft, leafy shoot. This can be repeated in late summer if rapid side-shoot growth occurs.
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.
These are the 3 Cs (crossing, competing and crowding) of pruning. On grafted trees you might see growth below the graft or in the ground, this is the rootstock trying to express itself as its own tree. These can be removed anytime as they rootstock growth will divert energy away from the grafted tree.
The 1/3 rule involves cutting about 1/3 of wood during any pruning activity. This kind of moderate pruning is like giving your shrubs a good balance – it thins them out a bit and encourages new growth.
Follow the 1/3 rule
This can mean removing one third of the total height, or one-third of the total number of branches, depending on the type of plant and how severely it needs to be cut back. It's best to err on the side of caution and cut too little than too much.
3) The 3 in 1-2-3 refers to 3-year-old wood that was cropped when 2 years old and sometimes 1 year old. Renew the 3-year-old wood by cutting it back hard (Figure 3). This way you will generate new laterals, and the cycle starts again (Figure 4).
Make pruning cuts just outside the branch collar to avoid damaging the trunk and compromising wound responses. Improper pruning cuts may lead to permanent internal decay.
If you learn nothing else about pruning, remember the May Rule. If the shrub blooms BEFORE May, then prune the plant immediately after (or while it's blooming to bring the blossoms inside for an arrangement) the shrub has bloomed.