Pruning Young Trees To Strengthen Trunk
Images Source - TREES, ASSOCIATES, and SHIGO (2 CD set).
Removing the lower branches on a young tree over a three year period can strengthen the central leader. Prune the first 2 years back to a lateral on the branch (1 and 2) 1 is the first year and 2 is the second. The 3 would be the third year back to the branch collar. Not wounding the collar and not leaving a stub. For making the third year cuts - see below for targets.
The works of Dr. Alex L. Shigo.
John A. Keslick Jr.
Consulting Tree Biologist
Text & Graphics Copyright 2009 Keslick & Son Modern Arboriculture