Link: http://embarkservices2-px.rtrk.com/blog/blogs/

As winter deepens, homeowners and property managers are advised that tree failure is a major cause of property damage. An ice storm or high wind can cause a cracked tree to fail under its own weight.

“Homeowners worried about trees falling and damaging property should call a professional arborist in for an inspection,” advises Tchukki Andersen, staff arborist with the Tree Care Industry Association. Andersen notes that trees are designed to withstand storms, but all trees can fail – and defective trees fail sooner than healthy trees. A sound tree becomes potentially dangerous when the tree’s woody structure is weakened by one or more defects. During storms, pre-existing defects predispose trees to failure.

“To a professional arborist,” notes Andersen, “defects are detectable signs that a tree has an increased potential to fail.”

One of the major warning signs of tree failure is a visible crack. Cracks form when the load exceeds the capacity of the stem to withstand the load. The vast majority of cracks are caused by improper closure of wounds, by the splitting of weak branch unions, or by flush-cut pruning. Cracks can occur in branches, stems or roots. The wood behind the crack may be sound, decayed, or missing (cavity). Several types of cracks can be found in trees and, like other defects, the severity of cracks ranges across a spectrum.

Vertical cracks run with the wood grain along the length of the tree and may appear as shear cracks, inrolled cracks or ribbed cracks. Horizontal cracks run across the wood grain. Shear cracks, a type of vertical crack, become hazardous when they go completely through the stem and separate the stem into two halves. As the tree bends and sways in the wind, one half of the stem slides over the other, elongating the crack. Eventually the enlarging crack causes the two halves of the stem to shear apart. A shear crack always has a high risk of failure. An inrolled crack, also called a ram’s horn, has margins that curl inward on each of its sides and forms inrolled bark and wood. An inrolled crack is formed when a wound does not close properly. Serious decay is always associated with an inrolled crack because the crack margins rewound the tree each year, allowing decay to spread rapidly. Inrolled cracks often generate other cracks in the same stem segment. Trees with an inrolled crack, advanced decay, and another crack all in the same stem segment have a high risk of failure.

A professional arborist can determine the potential for failure by measuring the shell thickness in a few locations around the tree’s circumference, determining the width of the crack opening and looking for the presence of any other type of crack. Ribbed cracks are created as the tree attempts to seal over a wound. Margins of the crack meet and mesh but are reopened due to tree movement or extremely cold temperatures. Thicker annual rings are created in order to stabilize the developing crack at the location of the crack. This forms the ribbed appearance over a period of many years. A ribbed crack has a high risk of failure when associated with another crack or with extensive advanced decay.

Horizontal cracks run across the grain of the wood and are formed when loading in the tree’s crown pulls wood fibers apart. They are rarely found because they develop just before the trees fail. Horizontal cracks are a sign of imminent failure in leaning trees.

What can you do?
Cracks are hazardous when they compromise the structure of the tree by splitting the stem in two or when another defect , such as internal decay and a crack, do not provide enough sound wood in the outer shell to support the tree. The presence of multiple cracks and decay indicates a very defective tree.

Find a professional
A professional arborist can assess your landscape and work with you to determine the safest course of action. Contact one of Embark’s TCIA Certified Arborists today!

Link: http://www.embarkservices.com/blog/blogs/

Proper pruning of your trees is imperative not only for aesthetic appeal of your landscape, but also to maintain the health of your trees. For a new tree, pruning fosters healthy growth, sturdy branching structure, and necessary shaping. Pruning can also help in the building of the strength of a tree to combat extreme weather conditions. For example, a properly thinned tree will be better able to withstand high winds in events such as hurricanes or storms.
However, pruning is a process, and each cut that is made has the potential to change the growth of the tree. In fact, if a tree is pruned improperly the result can be damage that will extend to the full life of the tree, or could even shorten the lifespan of the tree.

Common reasons to start the pruning process are to remove dead or dying limbs, balance or shape the tree, or to remove branches that may have become hazardous to your home or family.

Most maintenance pruning can actually take place at any time throughout the year without negatively affecting the tree. Woundwood development and tree health is potentially increased when pruning occurs in early spring. To avoid tree stress, it is recommended that a heavy pruning is not done immediately after the visible spring growth of the tree. Heavy pruning is recommended to be done in the fall.

However, all pruning is not created equal. Here are different types of pruning from which trees can benefit:

Crown Cleaning: Dead, dying, weakly attached, crowded, or diseased branches are removed from the crown of the tree.

Crown Raising: Lower branches from the tree are removed to improve clearance heights for houses, vehicles, surrounding landscape, and of course your family.

Crown Thinning: Branches are selectively removed to increase air circulation through the crown and to increase the amount of light able to penetrate through the branches. The weight on heavy limbs is reduced and the foliage of the tree opens helping the tree retain its natural shape. A common mistake is over-thinning which will leave a tree unbalanced and can result in limbs that are more prone to failure.

Crown Reduction: The size of the tree is reduced. This process is most commonly used in coordination with utility lines. The height and width of the tree is reduced while the structural integrity is maintained.

As a tree ages, it will require less routine pruning as long as the proper pruning was a part of the initial growth process. In fact in large, mature trees, pruning is often a process of only removing dead, dying, or potentially hazardous limbs.

Arborists certified by the International Society of Arboriculture play key roles in the pruning process as they will be able to determine what type of pruning is best for your tree, and for you. With a Certified Arborist, the guesswork of which branches to cut is eliminated as are many safety concerns. Pruning large trees can be very dangerous. Peace of mind can come with a professional crew with all of the necessary safety equipment, liability insurance, and worker’s compensation insurance. Embark’s team of Certified Arborists, degreed Foresters, and highly experienced crews will work to help ensure the health, safety, and beauty of your trees.

Trees add to the value and beauty of your landscape, but only if properly maintained. Make sure that your trees are properly pruned so that they can reach their full tree potential.