Can you help me troubleshoot why my hydrangea wont bloom?

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Hi I have about 10 hydrangeas, many different species. Oak leaf, lacecap, etc...this year I barely got any blooms on most of my plants with the oak leaf being the exception..I think i might know why but am not sure...for the last few years I haven't cut back any of them with the exception of the oak leaf ... the reason being because I don't know which ones I'm supposed to. I know some of them should be cut way back and others aren't supposed to be cut at all. Do you think this is why they aren't flowering and if so how do I know what to cut or not ?? All suggestions are appreciated..Thanks

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