What's your question? Ask

Did your hydrangea freeze to the ground. The only answer I can come up with (if not) is that buds formed last Fall were damaged from the cold to the point where they just didn't burst forth for you this year.

The mold is the result of high humidity. All you can really do is keep the area as dry and well ventiliated as possible. Water plants only when the soil around them is dry.

Try increasing the phosphorous level. Best way to do this is working bone meal into the soil.

check for insects like aphids or mites

Typically if the branches won't stay up on their own, this indicates that either the plant is not getting enough light or that the plant is perhaps become a bed for an animal. If the branches lay down in a circular pattern, then it is likely an animal making a bed there. Add some sticks stuck in the ground to deter this. If the branches are more leggy looking and that is why they won't stay up, then the plant may be blocking its own light. For this year, all you can do it try to prop it up. For next year, when you do your pruning, try to thin the plant out a bit - remove old growth and any weak stems. This should help light reach the center better and prevent leggy stems that fall over.

I would put it off until fall if at all possible, or wait until next spring. However, as long as the plant is properly acclimated beforehand and the temps are not too hot/cold, you can still go ahead and move your hydrangea now. Be sure to place it in a suitable location and give it plenty of water deeply until the plant re-establishes itself. Also, make sure to get up as much of the roots and surrounding soil with it. You may want to prune it back some too so that the plant focuses on root growth rather than foliage/blooms.