Hydrangeas: Cutting back hydrangeas...., 1 by KiMFDiM

KiMFDiM wrote:
My mother gave me her hydrangea...we dug it up in the spring and I transplanted it at my house in the fall.

We do not know what kind it is. I live in zone 5b and it does not die over our harsh winters if it is wrapped in burlap before snow. Please see pic below to help identify. The flowers look pale, but they are actually blue and purple. After the blue and purple began to fade in early fall, they are a yellow-green with pink and purple splotches all over them...quite stunning.

Anyway, I know some get pruned in fall, some in spring. Since I am not sure what I have, what would happen if I did not prune it at all? Would it be safer not to prune it instead of risking no blooms for several years? Any advice?

Thanx in advance,
Lisa