By Skip Kincaid, Certified Arborist, Davey Tree Company (This article first appeared in The Gateway Gardener January/February 2006 issue.) It’s a question I am asked several times a week.  “Do I really need to prune my tree?  Don’t trees prune themselves?” The answers, of course, are a definite yes and a qualified yes.  Trees that grow in mowed or manicured

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