Stromanthe thalia

Common Names

Triostar, Tricolor, Prayer Plant

Summary

Native to Brazilian rainforests, this rhizomatous evergreen perennial in the Marantaceae family has upright, clumping growth and striking variegated leaves: green with white/cream and pink hues, and pink to magenta undersides, with nyctinastic leaf folding at night; mature plants typically reach about 2–3 ft tall and 1–2 ft wide.

Care requires high humidity (60–80%), temperatures of 65–80°F, and a loamy, moisture-retentive yet quick-draining soil; keep soil consistently moist, watering when the top inch dries; provide semi- to shade and avoid harsh direct sun, using humidity boosters such as pebble trays or misting; fertilize monthly in spring and summer; propagate by root division in spring; not frost-hardy; commonly grown as a houseplant or in shaded landscapes; pests include mealybugs, gnats, aphids, and spider mites, with fungal issues linked to high humidity; non-toxic to pets and humans.

Lifecycle

Perennial

Height

2-3 feet

Spread

1-3 feet

Hardiness Zones

Zones 10a-12b

Sunlight Requirements

Ideally partial shade.

Soil Type

Loamy, moisture-retentive yet quick-draining soil rich in organic matter; pH 6.0–7.3.

Soil Drainage

Well-drained, moist but not waterlogged soil.

Soil pH

6.0-7.3

Bloom Color

White

Bloom Time

Spring

Foliage Color

Green upper surface with white and pink variegation; pink undersides.

Fall Foliage Color

Red

Leaf Lifecycle

Evergreen broadleaf

Growth Rate

Moderate growth rate

Seasons of Interest

Spring and Summer

Propagation Methods

Division (primary method; spring; divide rhizomes/offsets with 3–4 leaves), Seeds (rare; cultivars often sterile; not commonly used), Cuttings (stem cuttings do not root reliably; not recommended)

Attracts Wildlife

Attracts bees, hummingbirds