I’ve found that hydrangeas tend to have the occasional year of rest for no apparent reason. However, the more common causes are incorrect pruning or frost damage. Although you say one of your three is flowering, so unless you’ve treated them differently, or the flowering one is more sheltered, that’s hardly the case. If there was blackening of the leaf buds as well, then I’d say frost damage
Just to be sure, check the type of hydrangea you have and that you’re pruning them at the right time of year. It’s also worth checking the acidity of the soil and giving them all a dose of sequestered iron. Good luck for next year!
Originally Posted by: Caz