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Triostar Stromanthe

Stromanthe thalia ‘Triostar’

Long leaves patterned in cream, green and pink, with burgundy undersides. Give Triostar filtered light, warm humid air and a moist, freely draining root zone.

Explore the care guide
Botanical illustration

Care at a glance

Light

Bright indirect light, protected from strong direct sun. [10]

Watering

Keep the mix evenly moist during growth and drain excess water. [6]

Know your plant

Triostar is a cultivar of Stromanthe thalia, also sold as Stromanthe sanguinea ‘Triostar’. It belongs to the Marantaceae family. [3][5]

Its elongated leaves carry green, cream and pink patterns above, with burgundy-pink undersides. [5]

The leaves fold upward at night, showing more of their colorful undersides, and change position through the day. [6]

Light and placement

Place Triostar in bright indirect light. Filter strong window sun or use a shaded position outdoors during suitable warm weather. [10]

Adjust the position as seasonal light changes, keeping the growing leaves bright while protecting them from direct scorching sun. [8]

Watering

  1. Check moisture before watering. Keep the root ball evenly moist during active growth, with free drainage. [4]

  2. Water thoroughly enough to wet the root ball and let excess escape. Empty water collected in the saucer or decorative cover pot. [11]

  3. Let the mix dry a little more between waterings as light and growth decline in the cooler months. [6]

Soil and pot choice

Use a quality soilless houseplant medium that holds moisture while draining freely. Keep the root zone aerated. [6]

Choose a pot with drainage holes, proportionate to the root ball. Leave space below the rim for watering. [12]

Temperature and humidity

Triostar grows well in steady warmth above 65°F / about 18°C. Protect it from cold drafts. [6]

Provide humid air around the foliage. Keep the plant away from drying radiator heat and use a bright, humid room when available. [9]

In a dry room, use a humidifier and monitor humidity with a sensor. Keep the plant away from direct heat and drying drafts. [14]

Feeding

Feed periodically during active growth, following the product’s indoor-plant directions. [6]

A low-nitrogen liquid fertilizer is specified in RHS’s cultivar guidance; follow the chosen product’s directions. [7]

Repotting

  1. Repot when the clump and roots fill their container. Choose spring or early summer for fresh root growth. [9]

  2. Use a modestly larger draining pot and fresh houseplant medium. Settle the root ball carefully at its existing level. [20]

  3. Water through after repotting and let excess drain away. Keep the plant in its gentle-light growing position. [12]

Propagation

  1. Divide a healthy rooted clump in spring before fresh growth starts. [4]

  2. Separate rooted portions that retain several leaves. Pot each division into its own container with fresh houseplant medium. [15]

  3. Keep new divisions warm, humid and evenly moist while growth resumes. Check each small pot separately. [8]

Pruning and foliage care

Snip away dried or damaged leaves with clean scissors to keep the clump tidy. [9]

Enjoy the pattern across the whole clump: the proportions of cream, green and pink vary between leaves. [6]

Problems and checks

Brown tips or dry edges

Possible causes
  • Dry indoor air.
Checks to distinguish them
  • Check room humidity and exposure to drying heat.
Low-risk next step
Improve humidity and move foliage away from direct heat.
When to seek expert help
Seek horticultural advice for new damage that continues after humidity improves.
Sources for these checks

Dry indoor air can brown tropical houseplant leaf edges. [14]

Leaves remain curled or wilted

Possible causes
  • Dry roots or roots impaired by prolonged wetness.
Checks to distinguish them
  • Check the mix and drain; compare the roots and stems with their usual firmness.
Low-risk next step
Water a dry root ball and drain it. Correct soggy conditions before adding more water.
When to seek expert help
Seek help for soft roots or a collapsing clump.
Sources for these checks

Wet-root damage can cause wilting because impaired roots cannot take up water normally. [13]

Pale or brown exposed patches

Possible causes
  • Strong direct sun.
Checks to distinguish them
  • Check whether affected leaves face the brightest direct exposure.
Low-risk next step
Filter the sun or move to bright indirect light.
When to seek expert help
Ask for diagnosis if patches spread after light is adjusted.
Sources for these checks

Direct sun can scorch the foliage. [10]

Fine webbing, speckling or cottony clusters

Possible causes
  • Mites or mealybugs.
Checks to distinguish them
  • Inspect leaf undersides, joints and neighboring plants closely.
Low-risk next step
Separate the plant and seek pest identification before selecting a treatment.
When to seek expert help
Ask for help when the infestation spreads or damages new growth.
Sources for these checks

Monitor this species for spider mites and mealybugs. [4]

Seasonal indoor care

Reduce feeding as growth slows and resume with active new growth. [8]

Check winter humidity and keep foliage away from heating vents. Continue checking moisture before watering. [14]

For a summer outdoor display, acclimate gradually after frost risk has passed and bring the plant indoors before autumn frost. [6]

Children and pets

Safety

Keep leaves, fallen foliage and cuttings beyond pets that chew plants. Eating plant material can upset a pet’s stomach. [16]

For suspected poisoning or signs of illness, contact your veterinarian or ASPCA Poison Control at 888-426-4435. Provide the botanical name. [17]

Keep the plant, cuttings and loose potting material beyond young children’s reach. Keep its botanical name with the pot. [18]

For a human plant ingestion in the United States, call Poison Control at 1-800-222-1222 or use webPOISONCONTROL. Elsewhere, contact your local poison service. [19]

Similar plants

Dottie has rounded dark leaves traced with a pink inset band and midrib. [2]

Triostar has longer blades, irregular green, cream and pink patterns, and burgundy-pink undersides. [5]

Dottie belongs to Goeppertia; Triostar belongs to Stromanthe. Their distinct leaf shapes create two different displays within the prayer-plant family. [1][3]

Sources

  1. Goeppertia roseopicta — Plants of the World Online

    Royal Botanic Gardens, Kew

    Accessed October 5, 2026

  2. Calathea plant named Dottie — US PP12,736 P2

    United States Patent and Trademark Office — Anne E. Lamb; original text via Google Patents

    Accessed October 5, 2026 · Publisher date: 2002-07-02

  3. Stromanthe thalia — Plants of the World Online

    Royal Botanic Gardens, Kew

    Accessed October 5, 2026

  4. Stromanthe thalia — Extension Gardener Plant Toolbox

    NC State Extension

    Accessed October 5, 2026

  5. Stromanthe thalia Triostar — Flora & Fauna Web

    National Parks Board, Singapore

    Accessed October 5, 2026 · Updated: 2021-10-14

  6. Stromanthe thalia Tricolor

    University of Wisconsin–Madison Extension — Susan Mahr

    Accessed October 5, 2026 · Updated: Revised May 2026

  7. Stromanthe sanguinea Tricolour

    Royal Horticultural Society

    Accessed October 5, 2026

  8. How to grow calatheas

    Royal Horticultural Society

    Accessed October 5, 2026

  9. Thirsty houseplants

    Royal Horticultural Society

    Accessed October 5, 2026

  10. Triostar Stromanthe

    University of Florida IFAS Extension

    Accessed October 5, 2026

  11. Watering Indoor Plants

    University of Maryland Extension

    Accessed October 5, 2026 · Updated: 2023-03-10

  12. Potting and Repotting Indoor Plants

    University of Maryland Extension

    Accessed October 5, 2026 · Updated: 2023-03-10

  13. Winter Indoor Plant Problems

    University of Maryland Extension

    Accessed October 5, 2026 · Updated: 2023-12-12

  14. How can I increase the humidity indoors for my houseplants?

    University of New Hampshire Extension

    Accessed October 5, 2026 · Publisher date: 2025-01-15

  15. How to Propagate Houseplants by Division and Offsets

    Iowa State University Extension and Outreach — Aaron Steil

    Accessed October 5, 2026 · Updated: Last reviewed January 2025

  16. Toxic and Non-Toxic Plants — plant precautions

    ASPCA Poison Control

    Accessed October 5, 2026

  17. ASPCA Poison Control

    ASPCA Poison Control

    Accessed October 5, 2026

  18. Poisonous and non-poisonous plants: An illustrated list

    National Capital Poison Center

    Accessed October 5, 2026

  19. Get help online or by phone

    National Capital Poison Center

    Accessed October 5, 2026

  20. Repotting houseplants

    University of Illinois Extension

    Accessed October 5, 2026