Plectranthus effusus var. longitubus (syn. Rabdosia, then Isodon)
Think of this as a woodland Salvia which blooms in the Fall. This Japanese jewel brings an unexpected and welcome shot of color to the shade garden in Fall with airy panicles to 3 or 4 feet holding zillions of small tubular purple-blue flowers. Something nice to look if you are overloaded on the reds-oranges-yellows classic colors.