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I'd wait until it has flowered, then cut it down by half to stop wind rock over winter.Next spring, prune it hard to a foot off the ground. It will reshoot and you can keep as many or as few shoots as you want.
I propagate buddlejas by soft cuttings about 6 inch long in may or june, before the flower shoots form. You can also do hardwood cuttings of 1 year old wood in winter.