Blue Mophead Hydrangea turned purple?
I'm just curious, normally after the blooms fade on my blue mophead they turn a brown color in the fall. However this fall they have turned a gorgeous deep purple color. What could cause this? I haven't ammended the soil. Could it be the barkmulch? My soil is acidic and not alkaline. I'm not complaining because I love the color, I'm just wondering what could have occurred for the color to change to purple in the fall? Any ideas? Thanks