Norway spruce trimming
I have Norway spruce that I planted 22years ago. They are about 30'tall. I have branches that are growing into the driveway. How far back can I trim them without damaging the trees?
Van Buren County Michigan
You can prune back to just before the branch collar, a slightly thicker area against the tree trunk. To maintain some green growth on a branch you prune back, be sure there are several groups of green needles left on the cut end. See the illustration showing “undeveloped fascicular bud” in this reference -
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