Hydrangeas are some of the most beautiful flowers in the world with over 75 species. “Hydor” means water and “angos” means jar or vessel, emphasizing the need to water this particular flower often. Hydrangeas don’t have petals, but sepals, which are leaves that protect the flower bud. Only after they age do they turn from green to the pigmented colors you see. Here is a sampling from Hickory, North Carolina.
Photos by Ravi 
Hello Ravi,
Very in depth information about the Hydrangeas. As you know and must have seen @ our home in the front(we have 4 of them), flowers lasts almost 7 to 8 months and they keep changing colors and when they dry up they’re brown, plants are zero maintenance once a year pruning in winter and fertilize and regular watering(every other day)through drip.
Good additional info, Niranjan!