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How to Trim a Skyline Honey Locust

Skyline honey locust (Gleditsia triacanthos f. inermis "Skycole") grows 30 to 45 feet tall and 25 to 45 feet wide with a pyramidlike canopy of feathery leaves. A thornless selection of the honey locust, Skyline provides filtered shade under its branches, and its dark-green leaves turn amber-yellow in autumn before dropping away. Honey locust trees prosper in a full sun exposure in practically any well-drained soil type in U.S. Department of Agriculture plant hardiness zones 3 through 7. Expect pruning wounds on this tree's branches to bleed considerable sap. It's not harmful to the tree, but focus your trimming during the fall, right after leaves drop off, to avoid excessive wound bleeding.

Things You'll Need

  • Hand pruners (secateurs)
  • Loppers
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Instructions

    • 1

      Trim away any dead or broken branches from the tree's canopy. Use hand pruners to remove dead or damaged branch tissues, making the cut 1/4- to 1/2-inch above a lower, healthy branch junction, or leaf or dormant bud. If the branch needing pruning is greater than 3/4-inch in diameter, use loppers to make clean, effective cuts.

    • 2

      Look through the branching canopy of the tree in the fall, trimming out any twiggy branches growing inward toward the center of the tree, or limbs that rub against other branches. Make cuts with hand pruners 1/4- to 1/2-inch above the twig's attachment to main branches or the trunk.

    • 3

      Thin out the numerous side branches sprouting from main branches in the tree's canopy, as needed. This selection of honey locust for the most part is naturally well structured and develops an open habit. Scan branches to look for weak branch junctions such as those with a crotch angle less than 45 degrees, or if two side branches occur directly opposite each other. These situations call for thinning (removal) of side branching so crotch angles are at 45 degrees or more and side branching is distributed in an alternating fashion. Make pruning cuts 1/4- to 1/2-inch above the side branches' attachment to the main branch or trunk.