Rick, Dog Tooth Violets, Erythronium americanum, are one of the poorest choices for your conditions. In nature, they occur mainly in shady flood plains that have rich, deep, high moisture soil adjacent to woodland streams. Considering your descriptions of your soil conditions it is surprising that you have any surviving. Even when established, they are inconsistent as far as blooming. Your concern with growing wildflowers in general based on your experience with this species is unnecessary.
