'Superstition' Bearded Iris has such a dark purple flower that it almost looks black. The blooms are fragrant and large, making a striking addition to cut flower arrangements (even though the individual flowers each last only a day). The flowers spikes bloom above the wide straplike leaves in May and June. All German Irises perform best in dry or well drained sites. Iris germanica 'Superstition' is the darkest flowering germanica.