I've wanted to grow Heucheras in my north Texas garden ever since I "discovered" them at the garden store, then admired them growing at the Fort Worth Botanic Garden.
Every one I've ever planted has died, usually before the end of the growing season. And I've tried them in a variety of soils, locations, sun and shade, well-drained and moist locations.
Shade-loving plants generally thrive under the high deciduous shade that dominates my garden; but not Heucheras, even the native varieties. I wish I knew why.