luis_pr said:If the blooms were blue then this is a mophead or lacecap hydrangea. I would expect a rebloomer version would have developed late blooms in the last three years; since you say you have not gotten any blooms in 3 years then I assume it only blooms on old wood... their flower buds develop in July-September... at the latest (Sept) way up in the northern states.
Thus I would make sure you are not pruning the stems after June, that you are not fertilizing it too much/too often and that it gets some moisture once it goes dormant (snow can be considered moisture).
Growing a blue hydrangea that only blooms in old wood in zone 6 or less will also require winter protection of the hydrangea stems (not an issue for you in GA but I thought I would mention it just in case others in cold zones read this). For them, a potted hydrangea would need to be brought into a garage or heated room inside during winter. Any garage or shed may be ok in zone 7 but in colder zones like 4 or 5, it may help to use a heated garage.
Stems that are dried out looking.... completely... with no leaves... can be pruned all the way down by the end of May. On old shrubs, you can see part of the stem looking like hard dried out wood but at the very end the wood becomes green. This year's growth looks green. Last years maybe; even older stems would probably look dried out until you look at the very end of the stems. New growth from this year tends to be all green though.
Philipwonel said:To much nitrogen, maybe ?