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Yes.
Hydrangea are plants, and are naturally found in the ground.
yes
They usually fall to the ground.
Only to contain them within the space available. The only pruning needed otherwise is to cut off the previous years flowers in the early spring.r
they change colour with the soil pH level.
yes
I posted a link that has everything you need to be succesfull in you Hydrangeas planting in the related links box below.
If the young plants are pot grown they can be planted at any time ,avoiding frost. If the plants have to be lifted from the ground then only move when dormant.
In gardening
No.
Aqua blue.