What now? I live in Ohio. Should I prune them down for next year?
You may be lacking phosphorus. If there is a lack of phosphorus in the soil, plants will have little to no blooms. You can either use a phosphorus rich fertilizer or add some bone meal to the soil. This article may help as well: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm
This article will help with pruning: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm
This article will help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm
Hydrangea leaves spotted brown and very unattractive. Help?
This could be a fungus developing. Treat the plant with a fungicide, such as neem oil, and see if this helps.
How do I prune hydrangeas?
This article will help with pruning: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm
I want to move this plant from the back yard to the front yard. .the locations have the same light and soil conditions. .
While fall is a great time for transplanting most plants, in cooler climates that experience harsher winters, it is normally better to do this in spring.
Since this plant is in the ground, and not a potted plant, I would wait until dormancy starts, then transplant. The plant will have all winter to make new roots and be on the way to becoming established without the trauma of having to make new roots, leaves and blooms at the same time. This article should help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/growing-hydrangeas-hydrangea-care-guide.htm
I bought a red hydrangea last year. The plant at the time was in a 8" pot and was replanted in the ground. This year it's a lot bigger but has become more deep pink than red. What will bring back that red color?
Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm
How do I train a hydrangea bush into a tree?
This article might help; https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm