Yes, mine are in clay soil in semi-shade. They are very happy. I've not had to encourage mine to get bushy, each year they get bigger and bushier.
I should think just putting them in the ground would do the trick.

I think I will, but when is the best time to do this? thank you

Any time. I would do it now if there won't be a drastic change for them, ie going from a warm spot to a cold/windy one.
Dig a nice big hole for them and give them some good compost to get them started and you'll (hopefully) get some beautiful plants.
Mine have a little shelter from the winds as they're behind a low edging, it seems to protect the new shoots a bit from the harsh weather during the winter.
I even have a photo of them in full bloom and covered in snow! They didn't mind at all!

thanks

I put mine into same and it is thriving...

well I replanted both in my border so fingers crossed.

will keep mine crossed for you.They are a lovely plant eh