Dietes grandiflora --Butterfly Iris--

AKA Fortnight Lily, South African native with slowly spreading rhizome clumps. Blooms dramatic 2-3" white and pale lilac blossoms in spring and summer, sometimes through fall, with narrow, sword-like leaves in clusters from early spring to first frost, regrowing from ground. Sun to part shade. Low maintenance, frequent blooms, drought resistant.