There is no true black iris, but iris enthusiasts adore Midnight Oil because its deep purple blooms get exceptionally close. This is such a useful color for mixed borders because it adds depth and drama to the display. It's especially charming in contrast to soft, pastel pink blooms. It blooms late in the season, giving the spring landscape one final boost of energy and excitement before summer blooms take over. Great for low-maintenance naturalizing—it's easy-care and deer tend not to bother it. We also like it as a sweetly fragrant cut-flower. Iris Germanica 'Midnight Oil'