How to Care for Calathea Triostar

Stromanthe sanguinea 'Triostar', often sold as Calathea Triostar, is a striking member of the prayer-plant family with bold leaves splashed in green, cream, and pink, and deep magenta undersides. Its leaves fold up at night in a praying motion. It is a moderately demanding houseplant that rewards attention to humidity and moisture with vivid color.

Light

Give Triostar bright, indirect light to keep its variegation vibrant. Too little light causes the pink and cream tones to fade and growth to slow, while direct sun scorches the delicate leaves and bleaches their color. An east-facing window or a spot near, but not in, brighter light is ideal. Rotate the plant for even growth.

Water

Keep the soil evenly moist but never soggy. Water when the top inch begins to dry, and take care to avoid both drought, which crisps the leaf edges, and standing water, which rots the roots. This plant is sensitive to mineral buildup, so use filtered, distilled, or rainwater, or let tap water sit out overnight before using. Reduce watering slightly in winter.

Soil & Potting

Use a light, well-aerated, moisture-retentive mix, such as a peat- or coir-based potting soil amended with perlite and a little orchid bark. Good drainage is essential to prevent rot, so plant in a pot with drainage holes. The mix should hold moisture without staying waterlogged.

Humidity & Temperature

High humidity is the key to success. Triostar thrives above 60 percent humidity and shows brown, crispy leaf edges in dry air. Boost humidity with a humidifier, a pebble tray, or by grouping plants. Keep it warm, ideally between 65 and 80F, and protect it from cold drafts, sudden temperature swings, and heating or cooling vents.

Feeding

Feed with a balanced, diluted liquid fertilizer about once a month during spring and summer. Triostar is sensitive to fertilizer salts, so use a weak dilution and flush the soil periodically to prevent buildup. Stop feeding in autumn and winter when growth naturally slows.

Propagation

Propagate by division. When repotting a mature, clumping plant, gently separate the root ball into sections, each with several leaves and healthy roots, and pot them up individually. Keep divisions warm, humid, and lightly moist while they recover. Division is best done in spring during active growth.

Repotting / Pruning

Repot every one to two years in spring, moving up one pot size when roots fill the container; this is also the ideal time to divide. Triostar needs little pruning beyond removing damaged, yellowed, or crispy leaves at the base to keep it tidy and direct energy to healthy growth. Use clean scissors to trim brown edges if desired.

Common Problems & Pests

Crispy brown leaf edges are the most common complaint, caused by low humidity, inconsistent watering, or mineral-heavy tap water. Fading variegation signals too little light, while yellowing leaves suggest overwatering. Spider mites are the main pest, thriving in dry air; raise humidity and treat with insecticidal soap. Curling leaves often indicate underwatering or low humidity.

Seasonal Care Tips

In spring and summer, water and feed during active growth, maintain high humidity, and repot or divide as needed. In autumn, reduce feeding and slightly ease off watering. Through winter, keep the plant warm and away from cold drafts and dry heated air, running a humidifier and watering just enough to keep the soil lightly moist.