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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 about Thalia dealbata (Aquatic) that is displayed on this web page is based on research conducted in our nursery's horticultural library and from reliable online resources. We will also include observations made about this plant as it grows in our nursery gardens and other gardens that we have visited, as well how the crops have performed in containers in our nursery field. We also incorporate comments that we receive from others and welcome hearing from anyone with additional information, particularly if they share cultural information that aids others growing this plant.
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