Wonderful in the perennial border and perfect for rain gardens, this cardinal flower is sure to stand out with its dramatic, dark chocolatey-purple foliage and bold red flowers. Superior to other dark-foliaged Lobelias on the market, 'Black Truffle' holds this deep color throughout the growing season. A magnet for hummingbirds and butterflies all summer, but deer tend to leave it alone. Introduced by Peter Heus and brought to market by Plants Nouveau.