It's best to do it in early/mid summer so that the new growth has a chance to harden off before winter. Just don't prune too late in the season - since any pruning will stimulate growth, you don't want fresh green growth to be exposed to winter chill. The dormant season pruning will stimulate more vigorous growth, when your goal should be instead to open the tree up to let more light in.
In your circumstance, you want to do a summer pruning rather than a winter (dormant season) pruning. (I say this more for understanding than for anything you can do about it, short of cutting down some of the competition.) This could cause some of the vigorous vertical growth that you see - it's trying to get up into the sun. If you are fertilizing this tree, I'd recommend that you stop, it doesn't seem to need any more!įrom what I can tell from the photos, it looks like this tree doesn't get full sun - it looks like there are other trees that might be slightly shading it.
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