These tender perennials, also known as Flax Lilies, are found wild in cool, moist forests of Tasmania and southeast Australia. Their height ranges from 1 to 5 feet. D. Tasmanica forms clumps of stiff, dark green, strap-shaped leaves. Panicles of bright blue, star-shaped, drooping flowers are produced in the summer; these are followed by deep blue berries in the fall. This plant grows up to 4 feet with a spread of 20 inches. Several others will be mentioned below in the varieties section. These have different shades of blue flowers followed by pretty blue berries.
From the Old World tropics of Asia south through the Pacific islands comes an attractive group of plants, possibly numbering 20-30 species, named after Diana, the Roman goddess, of hunting and Queen of the woods. In Australia they are collectively called the Flax lilies, which hints at their relationship to New Zealand Flax; both plants are now placed in the family Phormiaceae. In New Zealand the common name Blue Berry is applied in reference to the beautiful blue fruit. Dianellas are perennial herbs that form tufts or spreading colonies by spreading rhizomes. They grow best in full sun to light shade and tolerate moderate frosts and drought, although look best with occasional irrigation.
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