Thanks for all of the good information about hydrangeas. I have four endless summer hydrangeas planted on the north side of my home where they receive early morning and late afternoon sun. They bloom profusely and look wonderfully healthy but they haven't increased in size much in the three or four years I've had them. This past fall I bound them with burlap and filled it with shredded leaves but unfortunately many of the buds and wood froze. They didn't fare much better than the winters where I didn't protect them, actually. Is there any hope that these will reach the 3-5 feet they're supposed to grow or will they continue to stay small because of the dieback during the winter? How long does it take for these to reach mature size?