Hydrangea buds coming out in December

Hi, I had planted Hydrangea 2 years ago. They were blooming while I got them, and continued to bloom all summer. The leafs dropped in fall and I didn’t pruned the stem as this particular hydrangea has bloom in old…

I don’t know what to do with this hydrangea…

I first planted this hydrangea with flowers possibly 2014 (not full sun), then I transferred the plant to other place (not full sun) in 2018.  Since then I have never seen flowers… if there was, only one or two flowers…