Alphabetical Plant Listing

Thalia geniculata 'Ruminoides' (Red Stemmed Alligator-Flag)

Red Stemmed Alligator-Flag, Red Stemmed Thalia, Thalia geniculata f. rheumoides


Bold and tropical looking, Thalia geniculata 'Ruminoides' (Red Stemmed Alligator-Flag) is a marginal aquatic perennial forming a dramatic clump of long-stalked, erect, paddle-shaped, lime-green leaves that can reach up to 24 in. in length (60 cm). Blooming in late spring to mid summer, open panicles of silvery-blue flowers appear on slender stems well above the foliage. The stems are streaked in brilliant red and sometime are solid red, providing a striking effect in the pond or water garden. Red Stemmed Alligator-Flag is perfect along the shore of a large pond and looks splendid as an island clump in shallow water.

  • Grows up to 6-10 ft. tall (180-300 cm) and 2-6 ft. wide (60-180 cm).
  • Performs best in full sun to part shade in moist to wet loamy soils. Will grow in standing water up to 10 in. deep (25 cm).
  • A beautiful addition to bog gardens, rain gardens, water gardens or along ponds and streams.
  • Cut back in late fall in preparation for winter. Bring it indoors to spend the winter north of zone 9.
  • Propagate by seed or by division.
  • No serious pest or disease issues.
  • Native to the southern United States.

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Requirements

Hardiness 8 – 11
Heat Zones 7 – 12
Plant Type Aquatic Plants, Perennials
Exposure Full Sun, Partial Sun
Season of Interest Spring (Mid,Late)
Summer (Early,Mid,Late)
Fall
Height 6' – 10' (180cm – 3m)
Spread 2' – 6' (60cm – 180cm)
Spacing 24" – 72" (60cm – 180cm)
Water Needs High
Maintenance Low
Soil Type Loam
Soil pH Acid, Alkaline, Neutral
Soil Drainage Poorly Drained
Characteristics Showy
Native Plants United States, Southeast, Alabama, Florida, Georgia
Tolerance Wet Soil
Attracts Birds
Garden Uses Bog Gardens, Ponds and Streams, Rain Gardens, Water Gardens

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sevenke, Shutterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 8 – 11
Heat Zones 7 – 12
Plant Type Aquatic Plants, Perennials
Exposure Full Sun, Partial Sun
Season of Interest Spring (Mid,Late)
Summer (Early,Mid,Late)
Fall
Height 6' – 10' (180cm – 3m)
Spread 2' – 6' (60cm – 180cm)
Spacing 24" – 72" (60cm – 180cm)
Water Needs High
Maintenance Low
Soil Type Loam
Soil pH Acid, Alkaline, Neutral
Soil Drainage Poorly Drained
Characteristics Showy
Native Plants United States, Southeast, Alabama, Florida, Georgia
Tolerance Wet Soil
Attracts Birds
Garden Uses Bog Gardens, Ponds and Streams, Rain Gardens, Water Gardens

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Thalia geniculata 'Ruminoides' (Red Stemmed Alligator-Flag)

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