The pink flowers start out dark buds that open to hot pink clusters, fading to soft pink as the flowers age. Then, wonder of beauties, they become green.
No deadheading, heat tolerant, care-free, Invincible Spirit matures between 3 and 4 feet tall and wide. If you decide to go with a hedge of them, plant the centers 4 to 6 feet apart, leaving plenty of room for expansion and air circulation.
As for pruning, the flowers bloom on new wood, so prune after bloom applies to this Hydrangea, like most others. This is a deciduous shrub that you would prune in late-winter. Invincible is easy for most gardeners since it adapts to a wide range of soil types, though it prefers moist and well-draining spots.
This is a pink hybrid and the pH of your soil will not influence the color of the flowers.