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Pruning Young Trees- Training for Structure and Form Pruning
young trees provides the greatest benefit to train them to ensure their
performance, landscape potential and safety, and to minimize maintenance costs.
Unfortunately, proper training is not a standard practice in nurseries. Thus,
trees may acquire structural defects that can damage property, cause personal
injury or cause the tree to become a liability or to fail. Trees with failures
usually need to be removed. Training
reduces structural defects: co-dominant stems, multiple branches, weak
attachments and dense canopies. It lowers hazard potential, and therefore trees
live longer. Trained trees will have fewer branches that are well spaced, thus
needing less pruning and providing easier access for arborists as the tree
matures.
a. The tree location and use will determine its height from the ground. Street
trees need 8-foot clearance over sidewalks and 14-foot clearance over streets.
Parkway trees may have 6-foot clearance for branches parallel to the parkway.
b. Select a vigorous branch, and avoid any crotches with included bark. c.
Allow smaller branches to remain as temporary branches. Only
so much energy is available to the tree. Lateral branches are kept in check by
having to compete with the temporary branches for limited food supplies.
d. If branches near the lpb are too large, remove them or reduce their length by
1/2 to restrict their growth.
Scaffold branches are attached above the lpb. They are selected for attachment strength, spacing, and size. A
minimum of 18 inches vertical spacing is needed for trees that will be greater
than 12 inches diameter. 12 inches vertical spacing between scaffold branches
will be sufficient for smaller trees.
In general, prune no more than 25% of the entire canopy at any one time, unless defects are present. You may need to prune only 5-10% for proper training. Vigorous trees may need more pruning to provide branch spacing. Pruning is best done during winter dormancy: after leaf fall, before bud swell. | ... |
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TLCforTrees.info is maintained by: Douglas Airhart, Ph.D. Certified Arborist & Jeff Plant, Ph.D, Last Updated on: 07/11/03 |