In May, I bought a Coral Bells with beautiful golden-brown leaves with maroon undersides. The color lasted about 4-6 weeks, and now the leaves are green, with pale maroon undersides. My local nursery said it was because it wasn't getting enough sun, but when I *did* have it in the sun, it burned. I put it back in the shade quickly. Anyone know of a way to get the color back? I've been giving it morning sun since I talked to the nursery. This seems like a common issue, but I haven't seen anything about recovering the color.