What makes sedum 'Autumn Joy' dull in color?
I see 'Autumn Joys' that bloom with a deep reddish tint. My sedum 'Autumn Joy' always seems to have a much duller or watered down color. Actually, I assume it's an Autumn Joy. It was here when I moved in, and I don't know of any other sedum that looks like that. I also assume that it's an Autumn Joy because they are so popular.
Is there anything that affects the color? Would ammending the soil give it more vibrancy of tone? Any ideas?