donna, sometimes, even the experts are stumped on why a
plant doesn't do what it is supposed to do. it is kind of like when you go to a dr. and they can't quite decide if you have allergies or a cold. same thing. also, just like dr.'s, there are always more than one school of thought on what is happening and what is the "best" way to deal with something.
now, i am not even close to an expert. but, if it is really bothering you, and you can't figure it out by researching the web, i would call the local extension office (usually called "county extension services") and ask to speak to either the extension agent, or a local master gardener. they will be familiar with the quirks of the weather and anything else that might have discouraged blooms.
that said. i do know from experience that sometimes a
plant like a hydrangea, just won't bloom like it is supposed to for no appearant reason other than that
plant is taking that season off.
hope i have given you some ideas. sorry i can't be of more help.
