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This magnolia had only three trunks but one of those was definitely not an assett. The others need shaping up. Our usual time to prune Magnolia is in August or winter (for why, check this) but in this case we want to take advantage of the spring growing time to perhaps net some new shoots that can be better trunks. So we prune in spring just before growth begins.
What's Up 170: Prune magnolia, books, beech, Rose Bowl