Lobelia cardinalis 'Black Truffle' is an exceptional selection of our deciduous native (Canada south to Florida) cardinal flower from West Virginia plantsman Peter Heus. The purple-black foliage color holds very well through the year and is a nice color backdrop to the 4' tall spikes of bright red, hummingbird-magnet flowers in early August. Average to moist soils are perfect for cardinal flowers to thrive and don't forget to keep the rosettes uncovered during fall and winter.