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How to Prune a Cedar Tree

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How to Prune a Cedar Tree

How to Prune a Cedar Tree. Not every tree called a cedar is one. Although dozens of trees have common names that include the word "cedar," only four species of true cedars (Cedrus spp.) exist. One is very rare and only grows on the isle of Cyprus, but Lebanon cedar (Cedrus libani), deodar cedar (Cedrus deodara) and atlas cedar (Cedrus...

Not every tree called a cedar is one. Although dozens of trees have common names that include the word "cedar," only four species of true cedars (Cedrus spp.) exist. One is very rare and only grows on the isle of Cyprus, but Lebanon cedar (Cedrus libani), deodar cedar (Cedrus deodara) and atlas cedar (Cedrus atlantica) are cultivated in the U.S., thriving in U.S. Department of Agriculture plant hardiness zones 5b through 10a, 7 though 9a and 6 through 8, respectively. While true cedars do not require regular trimming, it may be necessary to pick up the pruners on occasion.
Don't confuse true cedars, native to the Middle and Far East, with "false cedars" that grow in the wild in the Western U.S. It is not difficult to tell them apart: Identify a true cedar by its dense evergreen needles at least an inch long, and the oblong cones up to 4 inches long that rise above the branches on little pegs. False cedars have needles that look like scales and tiny cones. While false cedars may require frequent pruning, true cedars do not. This is fortunate because true cedars can be forest giants, growing to 200 feet tall.
Horticultural experts at the University of Arkansas Division of Agriculture state unequivocally the general rule that "true cedars should never be pruned." While exceptions apply, cedars will not regrow if you prune deeper than the outer green branch tips. The dense growth creates a dead zone near the trunk where buds die from the shading. This means any trimming of a mature tree must be undertaken with care. Snip too much and you are left with a very sad looking, unattractive tree. Any tree shaping on true cedars should be accomplished while the tree is young.
Most true cedars do not require pruning to develop a strong structure, according to experts with the U.S. Forest Service. Lebanon, deodar and atlas cedars all grow in a soft pyramid shape with one central leader. If a young tree develops two leaders, the weaker one should be removed in favor of the stronger or better-formed one. Use bypass hand shears or hand pruners. Disinfect the cutting blade by wiping it with a rag soaked in denatured alcohol. Make the cut at the point the lesser leader emerges from the trunk. Do not apply wound balm or sealant, but allow the tree to heal itself.
You'll need to prune out cedar branches that have died or been damaged. No season is better than another for making these cuts, but wait for a few consecutive days of dry weather. Wet weather increases the likelihood of spreading disease spores. Your top concern should be to avoid spreading pathogens from the damaged cedar branches. Sanitize the cutting blades of your pruner or handsaw before each cut. Make the cut at least six inches into healthy wood. If the cut will be in the dead zone of the cedar, remove the branch at the trunk rather than leave a stub. Burn cut wood as quickly as possible after the pruning is done.
In an ideal world, all trees would be planted with sufficient room for them to spread as they mature, but accidents happen. If you find yourself with a cedar expanding beyond its allotted bounds, you can do limited size pruning to contain the branches. Reduce branch length by cutting off the branch tips, making the cut just above a lateral branchlet or bud. Be careful not to cut into the dead zone at the center of the tree; always make sure you leave at least a few green branches on the branch tip. Continue with other branches, maintaining an attractive and natural shaping. Sterilize the cutting blade before each cut.
All true cedars look more majestic and graceful when you leave the lower branches intact. If, however, your cedar is planted by a sidewalk or driveway, you may have to remove lower branches to permit passage. Start with the lowest branch and work up as far as necessary. Use a hand saw that cuts on the pull, and sterilize it before each cut. Remove branches flush with the trunk. For large branches, make three cuts, the first a foot from the trunk. Cut one-third of the way through the branch from the underside. Make the subsequent cut a few inches outside the first, severing the limb. The third cut should be flush with the trunk just outside the limb collar, the slight swelling at the base of the branch.

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