I know of no online source that lists them all. But Dirr's book on hydrangeas lists many. The problem is that new varieties appear on the market almost daily and depending on who the vendor is, may or may not be sold under different names.

Really the only valid selections with multiple names are those that are sold under a trademarked name (different from the patent name) and those from European breeders - like Blaumeise - that are sold under a synonymous English name.

I agree that it can be rather complicated....... :-)) Try posting what you think you have here....maybe we can simplify for you.

I shall post pics (when they don’t look so blah) and the names I have when we get a little closer to spring. Thanks for all the help-I just found this site and it’s helping me make it to gardening season!

Welcome!