Wednesday, 19 August 2015

Tree Ties & guards

Tree Ties 

• Trees are attached to stakes by tree ties. These come in a variety of forms. 
• If a guard is to be used, the best ties are metal rings coated with plastic (below). These do not attach physically to the tree but encircle the trunk and prevent excess movement. They allow some movement and therefore encourage the tree to support itself. However they can only be used 1m (3ft) or more from the ground since all movement near the root base has to be prevented. 
• Other ties usually consist of rubber strips (below right). These ground the tree and are then nailed to the stake. A rubber block is strung between the tree and the stake to prevent chafing.
• When staking close to the ground, ties have to be tight enough to prevent any movement of the root-ball. 
• Ties must be loosened or removed as a tree grows. Ties left too tight cause serious bark damage, as they cut into a growing trunk. Fast growing trees, such as poplars and willows, may need ties loosening every year. 
• Ties can usually be removed after three years; but if the guard is to remain for longer, a tie will often be necessary to prevent the tree from rubbing against it.

Guards 

• Trees are often damaged by vehicles, dogs and people. Tree guards help to protect young trees but they need to be maintained. Guards come in various forms. Some are made of a thin wire mesh. This prevents animals stripping bark (right) but offers limited protection from vandalism and vehicles. Plastic coated metal guards are more rigid and more attractive (see picture, below). Both types are attached to a stake with staples. In particularly vulnerable sites, heavy cast iron guards may be necessary. These are bolted to the ground.




Tree Surgeons Yorkshire