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Marcus, Joseph A.
Thalia dealbata Fraser ex Roscoe
Powdery alligator-flag, Powdery thalia, Water canna
USDA Symbol: THDE
USDA Native Status: Native to U.S.
Powdery alligator-flag is a robust, tropical, aquatic perennial, 3-6 ft. tall. The large, broadly lance-shaped, long-petioled leaves are covered with a white powdery coating as are all parts of the plant. The blue and purple flowers are crowded in an open panicle.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Color: Purple
Bloom Time: May , Jun , Jul , Aug , Sep , Oct
AL , AR , GA , IL , KY , LA , MO , MS , OK , SC , TX Native Distribution:
Locally on Coastal Plain from SC to TX & n. into OK, extreme s.e. MO & s. IL Native Habitat:
Cypress swamps; marshes; ponds USDA Native Status: L48(N)
Growing ConditionsWater Use: High
Light Requirement: Part Shade
Soil Moisture: Wet
Soil Description: Shallow water or poorly drained, wet soils. Mud, Saline tolerant
Conditions Comments: A dramatic, tropical looking plant with broad grey-green leaves. Small purple flowers bloom on tall flower stalks above the leaves. Good for wetland gardens and habitats. May be propagated easily by divisions. Larval food plant for the Brazilian Skipper butterfly.
BenefitUse Ornamental: Water garden, Bog or pond area
Conspicuous Flowers: yes
Interesting Foliage: yes
Deer Resistant: Minimal
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Record Modified: 2007-01-01
Research By: LAL