In March of this year, I transplated a six foot tall Canadian Hemlock from a terribly exposed location to the edge of another cluster of Canadian Hemlocks, which are thriving. I trimed the branches back about 1/3 and kept it well-watered, and it also thrived, with lots of new growth. Just in the past few days, all at once the leaves seemed to shrivel and wilt. I realized that it had been very dry here, though only in the 70's, and the shrub is in a moist and shady spot, and our soil is partly clay, so I admit I haven't been too focused on watering it in the past month. Today when I watered it, nearly all of the leaves fell off, and now mostly bare stems are visible.
Is it likely to come back if I keep watering it? Or is there a way to decide if it's too far gone?
If i killed it, I'd rather replace it now in the Fall.
Thanks for any advice.