Create Your Garden

Thalia geniculata ‘Ruminoides’ (Red Stemmed Alligator-Flag)

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

Thalia geniculata 'Ruminoides', Red Stemmed Alligator-Flag, Red Stemmed Thalia, Aquatic Plants, Marginal Aquatic Plants, Pond Plants, Water Garden Plants

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 from 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 sometimes 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.

Requirements

Hardiness 8 - 11
Heat Zones 7 - 12
Plant Type Aquatic Plants, Perennials
Plant Family Marantaceae
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)
Maintenance Low
Water Needs High
Soil Type Loam
Soil pH Acid, Alkaline, Neutral
Soil Drainage Poorly Drained
Characteristics Showy
Native Plants Alabama, Florida, Georgia, Southeast, United States
Tolerance Wet Soil
Attracts Birds
Garden Uses Bog Gardens, Ponds And Streams, Rain Gardens, Water Gardens
How Many Plants
Do I Need?
Learn Now

Recommended Companion Plants

Pontederia cordata, Pickerel Weed, Heart-Leaved Pickerel Weed, Wampee, Pond plants, Aquatic Plants, Plants for wet soilsAGM Award
Nymphaea odorata, American White Water-Lily, Fragrant White Water-Lily, Fragrant Water-Lily, White Water-Lily, Sweet-scented White Water-Lily, Sweet-scented Water-Lily,
Cephalanthus occidentalis, Common Buttonbush, Buttonbush, Button Bush, Globe-Flowered Bush, Honeybells, Little Snowballs, Swamp Globeflower, White Pond-Dogwood, Button Willow
Hibiscus coccineus, Scarlet Rose Mallow, American Scarlet Rose Mallow, Swamp Hibiscus, Crimson Rosemallow, Wild Red Mallow, Texas Star Hibiscus, Flowering Shrub, Red flowers, Red Hibiscus
Bacopa monnieri, Herb-of-Grace, Water Hyssop, Coastal Water-Hyssop, Water Purslane, Brahmi, Thyme-Leafed Gratiola, Indian Pennywort, Bramia monnieri, Lysimachia monnieri, White Flowers
Osmunda Cinnamomea,Cinnamon Fern, Shade plants, shade perennial, plants for shade, plants for wet soilsAGM Award
Crinum americanum, Swamp Lily, Florida Swamp Lily, Southern Swamp Lily, Spider Lily, Water Spider Lily, American Crinum Lily, Seven Sisters, String Lily, Crinum Lily, late summer flowers, Fragrant flowers, White Crinum, White Flowers
Iris virginica, Virginia Iris, Great Blue Flag, Southern Blue Flag, Iris for Ponds, Perennial for wet soil, Perennial for poorly drained soils, Purple Flowers
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.
Buy Plants

Requirements

Hardiness 8 - 11
Heat Zones 7 - 12
Plant Type Aquatic Plants, Perennials
Plant Family Marantaceae
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)
Maintenance Low
Water Needs High
Soil Type Loam
Soil pH Acid, Alkaline, Neutral
Soil Drainage Poorly Drained
Characteristics Showy
Native Plants Alabama, Florida, Georgia, Southeast, United States
Tolerance Wet Soil
Attracts Birds
Garden Uses Bog Gardens, Ponds And Streams, Rain Gardens, Water Gardens
How Many Plants
Do I Need?
Learn Now

Gardening Ideas

Plant Calculator

How many Thalia geniculata ‘Ruminoides’ (Red Stemmed Alligator-Flag) do I need for my garden?

Input your garden space dimensions

Your Shopping List

Plant Quantity
Thalia geniculata ‘Ruminoides’ (Red Stemmed Alligator-Flag) N/A Buy Plants

Please Login to Proceed

You Have Reached The Free Limit, Please Subscribe to Proceed

Subscribe to Gardenia

To create additional collections, you must be a paid member of Gardenia
  • Add as many plants as you wish
  • Create and save up to 25 garden collections
Become a Member

Plant Added Successfully

You have Reached Your Limit

To add more plants, you must be a paid member of our site Become a Member

Update Your Credit
Card Information

Cancel

Create a New Collection

Sign Up to Our Newsletter

    You have been subscribed successfully

    Join Gardenia.net

    Create a membership account to save your garden designs and to view them on any device.

    Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

    Join now and start creating your dream garden!

    Join Gardenia.net

    Create a membership account to save your garden designs and to view them on any device.

    Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

    Join now and start creating your dream garden!

    Find your Hardiness Zone

    Find your Heat Zone

    Find your Climate Zone