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| Category: Perennial |
| Family: Marantaceae (Arrowroots) |
| Origin: Southern States (North America) |
| Flower Color: Purple |
| Bloomtime: Summer |
| Height: 4-6 feet |
| Width: Spreading |
| Exposure: Sun or Shade |
| Irrigation (H2O Info): Aquatic |
| Winter Hardiness: 30-32° F |
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Thalia dealbata (Aquatic) (Blue Canna) - Spike of small purple flowers held high above foliage in summer. The slim cordate leaves grow on long petioles to 6 ft. tall, similar to Strelitzia. Spreads at a moderate rate by rhizomes. Prefers damp soil to submersion (to 18 inches) in full sun to light shade. The name for the genus honors German physician Johannes Thal (1542-1583) and the specific epithet means "whitened" or "covered with a white powder". Also known commonly as Alligator flag. Though we list this plant as hardy only to 30-32° F, if the roots do not freeze, it can survive through the winter and we have been notified that plants have survived in locations in USDA Zone 8a in a pond that froze solid after temperatures dropped to 5° F.
The information displayed on this page about Thalia dealbata (Aquatic) is based on our research conducted about this plant from books in our nursery library as well as from information that is provided by reliable online resources. We also have included our own observations made about it as it grew in the nursery gardens and other gardens visited, as well how the crops of this plant performed in the containers when we had them in our nursery field. We also include comments received from others and welcome hearing from anyone who has information about this plant, particularly if it includes cultural information aiding others to better grow it.
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