Dietes grandiflora, or Wild Iris/Fortnight Lily, is a hardy, clumping South African perennial known for its grass-like, sword-shaped leaves and large white iris flowers with yellow and mauve markings, blooming spring through summer. It's a low-maintenance, versatile, drought-tolerant plant ideal for borders, mass plantings, or pots, thriving in full sun to part shade and various soils, including wet conditions.