I'm not sure where you live but if you are zone 6 on up you can take some of that 2x4inch fencing from a hardware or farm store and stake poles around your hydrangea plant, wrap the fence around it and line it with burlap and fill it with hardwood leaves like oak not maple, and let it sit until you normally don't have to worry about frost. Remove the leaves carefully so you dont damage your tender bud sprouts and it will be loaded with flowers. I'm in zone 6 and I have done it a couple years and I would only get a couple flowers on my regular old school hydrangea if I didn't. The first time I did it my neighbor was asking how i had so many blooms and all different shades of blue, purple to pink lol TBH its a PIA but rewarding. I haven't done it last year. Now my OCD is focused on berries lmao. It went from heirloom tomatoes, to watermellon to hydrangea, to clematis vines to blackberries, raspberries, and blueberries. Lol now it IS WEE WEE WEEEEEED!

but I truly believe you will succeed if you do what I told you with the hydrangea. Beautiful plants. My blackberries are like most of my hydrangea now...bloom on new and old wood. Awesome! I will show a picture with and without protection.
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Here are some of my others I have and some have died as a result of not bringing my planter in the garage. 1st is Ms Saori. Beautiful one.
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This Ms Saori died but I have 2 others in the ground lol
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I have many many more pictures of my different flowers lol