Do you know what kind of hydrangea you have? Different hydrangeas have different pruning requirements and, if you prune the wrong one at the wrong time, it never will bloom because you are inadvertently cutting off the wood that would produce buds and blooms the following season.

On the page linked below, you can read about the two general methods used to prune most hydrangeas. If you aren't sure which sort of hydrangea you have, they have a link on their page that leads to further info on how to determine what sort of hydrangea you have.

How To Prune Hydrangeas

Just a thought, but are they getting enough sun? I know they are a shade shrub but they require more sun than you think.

Looks like I have a mophead variety. So I will leave it alone until after it blooms next year. The idea about not enough sun could be a possibility. Since it has grown so big so have the trees around it! I have it on the north side and it is huge. Use to have 50 + blooms. Thanks for all the information!

Sometimes you can limb up the nearby trees by removing limbs that are closest to the ground and that will let enough sunshine come through to encourage blooming. At some point though, the shade does become so dense that limbing up doesn't help enough. I hope that's not the case with your plant. It would be a shame if it never blooms again.

Yes it would! Thanks.