One of the most impressive perennials we grow is the giant Bidwill's coral bean, Erythrina x bidwillii. This amazing plant is a hybrid between the North American native coral bean and its South American counterpart. It starts flowering for us in late spring, and continues unabated until just before frost. Be sure you have plenty of room since it can reach 10' in width. We've grown this since the mid 1980s, so its seen 0 degrees F temperatures with no problem, although it is very late to resprout in spring.