Clint, I've had the same experience. Even in total shade, they croak. I wonder if perhaps they are sensitive to soil temps. I've tried varying the water, using mulch, various light levels, and nothing worked. For about 3 weeks in the spring, while nurseries are selling them, (for $10 apiece!) they look great. First sign of hot weather or even a hot dry wind, and they are toast. Our humidity is fairly low here, and yours is higher, so that's not the key. My best guess is they need cool, slightly dry soil and humid air?
