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Hardy water canna (or powdery thalia) is a rhizomatous marsh or marginal aquatic perennial that features long-stalked canna like foliage and violet blue flowers. It is a tall plant (to 6-10?) that lends a tropical flavor to ponds and water gardens. It is native to swamps and ponds from South Carolina to Florida west to Missouri and Texas. It is rare to Missouri, its distribution being limited to swampy areas in the southeastern lowlands region. Features paddle-shaped to lanceolate-elliptic blue-green canna-like leaves (to 18? long) on petioles to 24? long. Foliage is dusted with white powder. Violet flowers appear in branched open panicles (to 8? long) atop scapes typically rising well above the foliage to 6? (less frequently to 10?) tall. Blooms July and August
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Grow in wet soils or in shallow water in full sun. Best in organically rich loams. Plants are considered winter hardy to USDA Zones 6-10. Plants may also be grown in wet boggy areas. Containers covered by 18-24? of water will generally overwinter in place. Consider bringing other containers indoors to a greenhouse or other frost-free area with bright light. For plants grown in wet boggy soils, cut back tops and mulch heavily in winter.
| Common Name | Thalia |
|---|---|
| Botanical Name | Thalia dealbata |
| Container/Amount | 3 gallon |
| Evergreen or Deciduous | Deciduous |
| Hardiness Zone | 10a, 10b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b |
| Growth Rate | Average |
| Light Requirements | Part-sun, Sun |
| Height | 72" |
| Width | 36" |
| Soil Condition | Wet Soils |
| Water Needs | Average |
| Blooming Period | Summer |
| Flower Color | purple |
| Fragrance | No |
| Foliage Color | green |
| Deer Resistant | Yes |
