Thalia dealbata is a clump-forming aquatic perennial from wetlands of the southern and central United States, grown for its violet flowers and powdery blue-green leaves. Keep its roots wet or submerged and give it full sun.
Family
Marantaceae (Prayer-plant family)
Grows as
Aquatic
Light
Full sun
Water
Keep the soil constantly wet or submerged in shallow water, up to about 15 cm (6 in) deep.
Soil
Heavy garden loam or pond mud, or a pot with rich soil set in water.
Temperature
Hardy in temperate zones; roots survive winter if they do not freeze solid, protect in very cold climates.
How easy
Easy
Native range
C. & SE. U.S.A.
Climate
temperate
About
Thalia dealbata, the powdery alligator-flag, hardy canna, or powdery thalia, is an aquatic plant in the family Marantaceae, native to swamps, ponds and other wetlands in the southern and central United States. Its range includes much of Coastal Plains and the lower Mississippi Valley (States of South Carolina, Georgia, Alabama, Mississippi, Louisiana, Texas, Oklahoma, Arkansas, Missouri, Illinois and Kentucky). The plant has been grown as an aquatic ornamental because of the pretty violet flowers, and in cultivation has been proved hardy as far north as Philadelphia (Pennsylvania) and Vancouver (British Columbia).
Thalia dealbata grows to 6 ft (1.8 m), with small violet flowers on an 8 in (20 cm) panicle held above the foliage. The blue-green leaves are ovate to lanceolate, dusted with white powder and with purple edges.
Text excerpted from the Wikipedia article Thalia dealbata by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.