Stromanthe thalia 'Triostar'

Brazilian Origin and Cultivar History

From Bahia to Paraná in Brazil, Stromanthe thalia occupies the sheltered understorey of wet tropical forest. Its rhizomes form clumps, while flexible joints at the petiole tips allow the leaves to change position through the daily light cycle.

Stromanthe thalia ‘Triostar’ is a cultivated selection also known as ‘Tricolor’, with ‘Tristar’ appearing as a less common spelling. The older botanical name Stromanthe sanguinea is a synonym of S. thalia and is still widely used in horticulture.

Growing prayer plants indoors

Leaf care, feeding and root care: Cut a fully yellow leaf close to its stalk base, leaving healthy moving foliage intact. Feed gently while the clump is actively producing leaves. Move into a slightly wider container when the rhizome and roots occupy the pot. For propagation, divide only a strong clump and keep roots with every section. Vegetative division preserves the cultivar; seedlings do not reliably retain its variegation.

Watering, root care and temperature: Low-mineral water is preferable where tap water is hard, and periodic flushing helps prevent salt-related margin damage. Use a fine, moisture-retentive substrate with enough coarse material to keep air around the rhizome. Water as the top begins losing moisture, then let the whole pot drain. Shorten the interval during vigorous warm growth and lengthen it in winter without leaving the centre of the pot cold and waterlogged.

Light and watering: Keep Stromanthe thalia ‘Triostar’ in bright shade, avoiding direct hot sun on the broad cream and pink sectors. Moderate to high humidity reduces stress as leaves unfold, but a humid enclosure with wet foliage and no airflow creates a different problem.

Warning Signs and Corrective Care

Cream and white areas often brown before the green parts of a ‘Triostar’ leaf. Possible causes include poor water quality, accumulated salts, repeated drying, damaged roots, hot direct sun and contact with cold glass or heated air. Once the likely cause is clear, correct it and preserve the healthy green growth that supplies much of the leaf’s energy.

Mite feeding appears as pinprick fading and sometimes webbing beneath the leaves. Thrips leave uneven silver scars and tiny black droppings inside folded new growth. A cool, wet root ball with soft rhizomes points to root damage, not lack of water. Remove the rotten tissue, then return the plant to warmth with a looser mix around the remaining roots.

Stable cream-green marbling, pink tones, burgundy undersides and daily leaf movement all belong to ‘Triostar’. The difference is progression: normal colour remains firm and stable, while damage spreads, softens or develops an unpleasant smell. Move an affected ‘Triostar’ away from nearby plants. Keep the leaves dry and disinfect tools after handling it.

Stromanthe thalia ‘Triostar’ is non-toxic to cats and dogs

• This plant is non-toxic to cats and dogs.
• Its effects on people are unclear, so keep it away from young children who may chew it.
• Eating a large amount can still cause an upset stomach. Seek medical or veterinary advice if symptoms continue.

Stromanthe thalia: where the name comes from

Stromanthe joins Greek stroma, meaning bed or spreading layer, with anthos, flower. The epithet thalia recalls the genus Thalia, which Linnaeus named for the German physician and botanist Johannes Thal.

Otto Wilhelm Sonder established the genus Stromanthe in 1849 in Neue Allgemeine Deutsche Garten- und Blumenzeitung, volume 5, page 225.

José Mariano da Conceição Vellozo first described it as Heliconia thalia in 1829 in Flora Fluminensis, volume 3, 106, plate 21. João Marcelo Alvarenga Braga later placed it in Stromanthe as Stromanthe thalia in 1995 in Eugeniana, volume 21, page 23.