A sturdy flowering perennial that grows in low clumps and hails from Australia, Dianella can play a significant role in ornamental grasses in a landscape. Dianella is commonly known as flax lily. Dianella is a clumping, strap-leafed perennial rising to 30 inches tall, with sturdy bladed foliage that fans out from a central clump. A tropical plant that can survive a frost. It has star-shaped flowers with prominent golden anthers (typically blue or white, depending on the cultivation) that arrive in the spring and are followed in mid-summer by oblong rich metallic-blue berries.