Believe Old wood still in bloom Month to prune and how much? https://photos.app.goo.gl/RpJTqWF3SeGXHn9x7
Washington County Oregon
Thank you for your question. I think the hydrangea variety you pictured is a Hydrangea macrophylla, or large leaf hydrangea (in alkaline soil, judging by the pink flowers). Assuming that is correct, you can prune either in the fall or the spring, as this Extension article indicates: https://extension.oregonstate.edu/gardening/flowers-shrubs-trees/general-care-hydrangeas
Hope this is helpful. Good luck!