You can shear them a back and as long as you leave some foliage on the plants they will be fine. The best time to transplant them is in Oct or Nov when the brunt of the hot weather has passed and fall is well underway. Partial shade will work if it is part sun with very bright shade. In a lot of shade they won't bloom very well. You may also want to look for the variety Mystic Spires with is just like Indigo Spires but only reaches about 2 1/2 feet.
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