Stromanthe Triostar

Stromanthe sanguinea 'Triostar' (syn. S. thalia)

FoliageModerate–HardModerate🐾 pet-safe

Good to know: A prayer-plant cousin, so leaves fold upward at night, flashing their wine-red undersides. No two leaves carry the same pink-cream-green pattern.

Through the year 🗓️

☀️ Summer now

Water more often in the heat and shield it from any direct sun through nearby windows.

🍂 Fall

Taper feeding to a stop and move it away from cooling windows and heater vents.

❄️ Winter

Rest it: water a bit less, skip fertilizer, and run a humidifier against dry heated air.

🌱 Spring

Repot or divide crowded clumps and resume monthly feeding as new leaves unfurl.

The details

Light & placement

Light: Bright indirect; the pink variegation needs good light but direct sun scorches it fast
Ideal PPFD: 100–250 µmol·m⁻²·s⁻¹
Grow-light distance: 18–24 in below LED

Water & feed

Watering method: Keep evenly moist, never soggy, watering when the top inch dries with distilled or rainwater. Tap-water salts and fluoride brown the edges quickly.
Fertilizer: Balanced feed at ¼–½ strength, monthly in spring–summer.

Home & habit

Soil: Airy, moisture-retentive mix (peat/coco + perlite); pH 6.0–6.5
Humidity: High (60%+); crisps below 50%
Temperature: 65–80 °F; keep above 60 °F, no cold drafts
Mature size: 2–3 ft tall indoors
Repotting: Every 1–2 yrs in spring; divide crowded clumps then
Propagation: Division of the rhizomatous clumps at repotting; cuttings don't work.

When something looks wrong

Overwatering signs: Yellowing lower leaves, wet soil that stays wet, mushy stems at the base
Underwatering signs: Curling, rolling leaves; crispy brown edges and tips
Common pests: Spider mites (love the dry-air-stressed ones), mealybugs, fungus gnats

Care notes: Humidity and water quality make or break it. Dry air plus tap water equals crispy brown edges no schedule can fix. A humidifier nearby earns you those flawless pink-splashed leaves.

Common problems 🩺

The usual suspects when Stromanthe Triostar looks unhappy. Most houseplant trouble is watering or light, not disease — see all plant problems if you are not sure which plant is the culprit.

Brown crispy edges

Likely cause
Tap-water minerals and dry air. This plant shows both faster than almost anything.

What to do
Water only with distilled or rainwater and keep humidity above 60%.

Leaves curling and rolling

Likely cause
Underwatering or dry air.

What to do
Keep the soil evenly moist and run a humidifier nearby.

Pink variegation fading

Likely cause
Not enough light to hold the color.

What to do
Bright indirect light — but never direct sun, which scorches it.