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Tree Removal, is it time to remove your tree?
When a tree develops problems, it is frequently difficult to decide when to remove the tree. If an owner wants to keep the tree as long as possible, trees can frequently be maintained for many years by cutting out all dead or diseased portions and watering deeply when needed. Unfortunately, continually removing dead wood is expensive and sometimes neighbors are concerned about the possibility that the tree may fall on their property. if it has become time to remove the tree, try not to feel guilty. You can always replant a tree in that space, and utilize the firewood or mulch. Trees provide shade and climate moderation, hold soil in place, help keep air and water clean, increase property value, provide beauty. To decide whether to remove a tree, a number of questions need to be asked, the pros and cons weighed.
Is it a desirable species?
Undesirable trees include black locust, Siberian elm, box elder, Norway maple, tree of heaven, mimosa, empress tree, and certain willows. Invasive species are among the most undesirable trees. They can quickly dominate, destroy, and erode a landscape. Along with strangling nearby indigenous species. Characteristics that make some trees “undesirable” include: weak wood prone to frequent breakage, always dropping large quantities of debris, shallow roots that damage lawns and pavement, often infested with diseases or insects specific to the tree species or being an invasive species by prolific reseeding in the landscape.
How healthy is the tree?
If 50% of the tree is damaged, it probably should be eliminated. A tree that is in decline can continue to survive for many years but will always have limited or abnormal growth and appearance. Trees that have been damaged by herbicide frequently have misshapen leaves, but frequently can recover.
Is there trunk damage?
Vertical cracks, seams, dead branch stubs and large, older wounds suggest internal decay. Severe damage to the main trunk often warrants removal of the tree. If the damaged area is less than 25 percent of the circumference of the trunk, the wound could gradually heal over and no permanent injury should result.
Is the tree hollow?
Because the life support tissue, the xylem and phloem, of a tree is on the outer edges of the trunk many trees will live for years with a hollow trunk. The issue is possible compromised trunk strength making the tree dangerous. A guide to help in decision making is if one-third of the interior of the tree is hollow or rotten, it probably should be removed.
Are there large dead branches?
Large trees that have had their tops broken or large damaged limbs are a danger to people and property. If less than 25% of branches are damaged, the tree will probably survive. Crossed or rubbing branches should be removed. Narrow branch angles especially of the main trunk are particularly prone to splitting and should be corrected. This is best done when the tree is young. If a narrow crotch is too large to remove the two co-dominant leaders could be cabled to relieve the strain and avoid breakage. This procedure is performed by an arborist.
Are all dead branches on one side of tree?
If so, the tree will be lopsided and potentially hazardous. Dead branches that are all on one side of a tree can be a symptom of root or trunk damage on the affected side. Such trees should be evaluated by an arborist.
Are there sprouts coming from the base of the tree or epicormic shoots (small branches coming from the trunk)?
These sprouts are a response to severe stress indicating that there is something wrong with the tree. This is very typical of trees that have endured recent new home construction injury, over-exposure to the sun after thinning a forest or soil compaction. Have such trees evaluated by an arborist. These are an indication that all is not well with the tree.
Is there trunk rot or a large fungus growing near the base of the tree?
Not all mushrooms growing under trees are associated with root diseases, but fungi growing on the tree are an indication of internal rot and should be evaluated by an arborist.
Has there been excavation near the tree causing root damage?
If 50% of the root system is damaged, it probably should be removed.
Is the tree leaning?
Leaning trees are more of a hazard than those growing vertically. A sudden lean indicates breakage or weakening of roots and tree should probably be removed immediately. A tree leaning more than 15% from vertical probably should be removed.
Is the tree under power lines?
Trees under power lines should mature at heights less than 25’. A tree that is growing into power lines will need to be thinned out. During wet weather, electricity can arc as much as ten feet to wet tree foliage and ground out causing a power failure or property damage. Removal of trees limbs anywhere near power lines is never for the homeowner to do themselves. The price of an accidental touching of the power lines or a grounding arc of deadly electrical current to a ladder, pruning tool or a person will be devastating. Always hire a professional for these dangerous jobs.
What is the history of the tree?
Some previous pruning jobs can cause problems years later. A situation that follows the old, outdated, practice of “topping” trees is breakage of the regrowth. A change in the soil level over the root system is another cause of a gradual decline of trees. If three inches or more of soil has been piled over the root system of the tree, it will probably die. If caught early before stress symptoms develop many trees can be saved.
What is the environment in which the tree lives?
Another important factor in a trees possible need for removal is its environment. Trees growing on rock ledges or near a body of water frequently have shallow root systems. The removal of nearby trees is a common problem after new construction. Trees that are suddenly exposed to sunlight are severely stressed by the sudden change in exposure. Unfortunately, trees that are spared from removal during construction often die 3-5 years later. They succumb to soil compaction, grade changes and the sudden exposure to full sun after being grown in a forest.
How much space is available for tree growth?
Trees in the forest grow very well close together; therefore planting shade trees in groves replicating nature is fine. In such sites they will grow together as in nature to become one large mass. When it comes to your house, it is best not to have trees actually hanging over the roof. Generally large trees should be at least 20 feet from your house. On the other hand small trees, such as a dogwood, may be planted as close as 6 feet from the house.
Finally, some other considerations that can help you make a decision about the removal of a tree include:
Are there other nearby trees whose growth will be enhanced if the tree is removed?
Is the location of the tree such that it interferes with sight lines in traffic flow, stoplights, etc.?
Does the tree have historic or sentimental value?
When a tree has historic or sentimental value, more expense is justified to salvage it. However, if a tree is losing large branches, it is likely time for it to be replaced.
If you have questions about the health or safety of any tree, consult a certified arborist to have an onsite evaluation. Locate arborists certified through the International Society of Arboriculture.