Alligator Flag, Fire Flag, Red Stemmed Thalia

Thaliageniculata

Genus
Thalia (THAL-ee-uh)
Species
geniculata (gen-ik-yoo-LAH-tuh)
Synonym
Sun Exposure
Sun to Partial Shade
Foliage
Grown for foliage
Smooth
Height
8-10 ft. (2.4-3 m)
Spacing
24-36 in. (60-90 cm)
Hardiness
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
Bloom Color
Medium Purple
Bloom Time
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Other Details
Category
Ponds and Aquatics
Water Requirements
Very high moisture needs; suitable for bogs and water gardens
Foliage Color
Burgundy/Maroon
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
Patent Information
Non-patented
Propagation Methods
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; stratify if sowing indoors
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Regional

This plant is said to grow outdoors in the following regions:

Anniston, Alabama

Phenix City, Alabama

Boca Raton, Florida

Clearwater, Florida

Clermont, Florida

Jacksonville, Florida

Melbourne, Florida

Okeechobee, Florida

Oldsmar, Florida

Port Saint Lucie, Florida

Punta Gorda, Florida

Venus, Florida

Savannah, Georgia

Spotswood, New Jersey

Ronkonkoma, New York

Georgetown, Texas

Kemah, Texas

La Vernia, Texas

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Gardener's Notes:

5
positives
2
neutrals
0
negative
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G
Jacksonville, FL | April 2015 | positive

I bought a baby plant about 6 inches tall years ago. I now have 4 large planters full of this awesome plant. Very fast growth, bright red...Read More

Y
Ronkonkoma, NY | September 2010 | positive

this is my first season with this plant in my koi pond. I purchased this as a single baby plant on ebay . within a month it had grown dr...Read More

L
Clearwater, FL | June 2010 | positive

i love this plant! its foliage is beatiful. very hardy and quick growing. i have mine in a pot and it sucks up water like crazy! seems to...Read More

J
z8a, AL (Zone 8a) | March 2007 | positive

Last year planted this from a 6" pot into a 20" pot, and it grew so well I'll be repotting this spring into at least a 24" pot. Beautifu...Read More

W
Baton Rouge, LA | July 2003 | positive

This plant has been very successful in my garden which is located in Zone 8b. It started out last year as a small potted plant in one of ...Read More

T
T
Murfreesboro, TN (Zone 7a) | September 2001 | neutral

Thalia geniculata is slightly less hardy than T. dealbata. Its common name, Alligator Flag, may be the result of where the plant is found...Read More

F
Lutz, FL (Zone 9b) | September 2001 | neutral

Alligator flag is a large broad leafed aquatic plant with small, delicate purple flowers. The bisexual flowers have 3 petals, 3 small se...Read More

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