Plumbago (Ceratostigma plumbaginoides) Zone 5-9. Blooms a deep blue in late summer - fall, as the flowering finishes, the leaves begin a month long change to a vivid mahogany red color.
Works well in full sun to full shade and is very adaptable. Not rabbit resistant and can be an invasive plant.
Use it to your advantage by allowing it to take over areas where it is difficult to grow anything else. You won’t be disappointed.
Plant with Jupiter’s Beard, Yellow Columbine or purple Coral Bells.