Answer: This is actually quite a large plant when it reaches maturity, so this may be an ongoing problem if it is too large for where it is planted. The normal habit is to weep to the ground, this helps shade the roots and naturally keep the soil moister. The time to prune would be in early spring rather than now. The usual pruning guidelines would apply, begin by removing any winter damaged branches, broken or badly rubbing branches, then prune for shape. Do not remove more than 25% of the branches at a time. If you need to remove more than that, spread the work over several years. Also, make sure you do not damage the graft when you prune. If this is an older tree with thick branches, I would suggest you consult on site with a professionally trained and certified arborist before you try to prune it yourself. I hope this helps.
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