plant hydrangea glam rock

I have been given a hydrangea glam rock in a pot, which I would like to plant out into garden.
Can someone advise if I should do so now or wait til Spring?
Also any tips on care welcome. I believe I need to cut back in Spring.Do I do this before or after moving it (assuming Im leaving it in pot til Next year)

 

If it's pot grown McTavish now is the perfect time to get it in.Go for it

 

I have its "cousin", called Pistachio. Just be advised that these rebloomer macrophyllas may already have invisible flower buds at the ends of the stems. These flower buds are located at the ends of the stems and, typically, will open in Spring 2020 unless you prune the stems. So, you may want to hold off on any stem cuttings until after they bloom so you enjoy the blooms.

You can deadhead the spent blooms at any time though. That is done by cutting the petiole string that connects the blooms to the stem.

 

thanks though no idea what a ptiole string is?

 

another probably daft question.
Anyone advise best way to get it out of pot (its not a plastic one ) and how deep do I plant. I know hole needs to be bigger but should it sit level with or below top of hole?

 

Petiole is a reference to the part of a leaf that connects the leaf itself to the stem. Sorry, I tried to enter a link (with a picture) but the website will not let me do a save with it. ;o(

 

It normally advised to leave the deadhead on in cold areas it protects the lower buds from frost . And luis is right they will flower on old wood so don't cut it back or no flowers next year. Plant it level to where it was in the pot. Is the pot narrower at the top than in the middle ?

 

Because the pot is narrower at the bottom in the picture, I would use a knife, cut straight down and carefully lift it. Or, depending on the weight, I might put the pot upside down and then carefully extract the shrub. If it has roots growing from the bottom of the pot and these have grown into the ground, I would cut them...