Flax lily, Dianella tasmanica, is a spreading perennial with flat, glossy green leaves. This grass-like foliage plant is often used as a groundcover, border plant, or even as an accent plant, to bring color and texture into the landscape. This fast-growing plant also works well in containers. Drought-tolerant flax lily requires little care in the landscape once it is established, making it ideal for the busy gardener.