Hello,

The leaves on the plant still look in good shape, so I think that the blossoms are just fading a bit  - the extreme heat will frequently cause the flowers to mature and fade quickly.  When they look quite sad, you can clip them off to help stimulate more blooms.



Hydrangeas prefer part sun - and not late afternoon hot sun. Morning sun is best.  Water whenevert the soil feels dry - it's impossible to know how often that will be. It might well be daily, but on days like today, they may not need water.  Cut the blossoms where the flower stem meets the main stem.  Know that these will probably need to spend the winter inside your house, because most supermarket hydrangeas aren't hardy.

I am not sure I understand your question.  the plants look good - there is no need to transplant them.  Unless you are talking about putting both of them into a bigger pot so they can both get the right sunlight?  If you mean taking off the good looking blooms and planting that flower in another pot, that will not work.  If I don't understand what you mean, please clarify.