When I bought this hydrangea it was a brilliant pink but within 2 weeks its blooms have changed to green. They appear healthy and aren’t browning. They are potted with good drainage and sit on an east facing porch. All of the blooms were present at the time I brought it home with the exception of the small new cluster. I really want the color back on this plant. I don’t care WHAT color (pink, blue, white, purple) but I have no idea why it changed or what needs to be done to encourage the color to return. Suggestions needed and appreciated.