Tricolor stromanthe

Pinstripe calathea

Same family (Marantaceae), similar lance-shaped leaves and nyctinasty. Differences: ornata has cream/pink pinstripe markings rather than bold variegated streaks, and the underside is dark purple-green rather than magenta-pink.

Round-leaf calathea

Same family, but rounded leaves with silvery-grey banded patterns rather than streaked variegation. No pink at all. Plain green undersides.

Red-veined prayer plant

Same family, similar nyctinasty. Differences: Maranta has small oval leaves with fishbone-pattern dark blotches and red veins on a green ground, on a much shorter trailing-spreading habit. The classic 'prayer plant' that folds dramatically at night.

Ctenanthe / fishbone prayer plant

Same family. Pale grey-green leaves with dark green fishbone bands on the upper side and burgundy undersides. Different patterning, less pink content overall.

Bright indirect — east window or 1–2 m back from a south window.

Place 1–2 m back from a south or west window with a sheer curtain, or directly in front of an east window. Direct midday sun bleaches the pink variegation to pale orange and scorches the leaves. Below 8,000 lux the plant produces leaves with weaker variegation and is more prone to reversion to plain green. In Nordic winters most apartments fall below the maintenance threshold; a full-spectrum LED at 12 hours/day from October through March keeps the variegation crisp.

Seasonal: Move closer to windows in winter; pull back in summer.

When the top 2–3 cm of soil is dry — every 5–10 days in growth.

Water thoroughly until water runs from the drainage holes, then empty the saucer. Allow the top 2–3 cm to dry between waterings. Stromanthe is fussy about water quality — chlorinated tap water causes leaf-edge browning within weeks, and hard water leaves visible mineral spots on the leaves over time. Use filtered water, distilled water, or rainwater consistently. Room temperature only; cold tap water shocks the rhizome.

Seasonal: Reduce frequency to every 10–14 days in winter.

Moisture-retaining but free-draining mix — peat or coco coir based.

Use a moisture-retaining but free-draining mix: 50 % peat or coco coir, 25 % perlite, 25 % orchid bark. The mix should drain freely but stay slightly moist between waterings. Stromanthe is more peat-loving than most Araceae — it is happiest in a mix that retains water without becoming soggy.

60–80 % required — struggles below 50 %.

Among the most humidity-demanding mainstream houseplants. Below 50 % the leaves develop crispy edges and curl inward; below 40 % the plant rapidly declines. In dry Nordic winter air a humidifier running near the plant is effectively required. A glass cabinet or grow tent provides the most stable environment for serious specimens. Misting helps briefly but cannot maintain the ambient humidity the plant needs.

18–27 °C; damage below 15 °C.

Tropical Atlantic-rainforest species; does not tolerate cold draughts or temperatures below 15 °C. Cold exposure causes leaf darkening and abscission. Keep clear of unheated entryways, away from cold glass on winter nights, and away from radiator drafts that desiccate the leaves.

Quarter-to-half-strength balanced liquid feed every 4–6 weeks in growing season.

A balanced liquid fertiliser (NPK 10-10-10 or 20-20-20) at quarter to half label rate, every 4–6 weeks from April through September. Stromanthe is salt-sensitive — overfeeding causes immediate leaf-edge burn. Flush the soil thoroughly every 2 months to prevent salt buildup, which especially damages the variegated tissue.

Seasonal: No feeding from October through March.

Remove old yellowing leaves at the petiole base; cut off any reverted (all-green) growth.

Cut yellowing leaves cleanly at the petiole base with sterile scissors. If a stem reverts entirely to plain green, cut it off at the rhizome — reverted growth is faster and will crowd out variegated growth. Pet-safe sap means no special PPE is needed beyond ordinary hygiene, though sterile scissors prevent disease spread between plants.

Every 2–3 years in spring; tolerates being slightly pot-bound.

Move up by a single pot size when the rhizome fills the pot and the clump becomes crowded. Spring is best, just as new growth resumes. Repotting is also the right moment to divide the rhizome for propagation. After repotting, water thoroughly once and then keep on the slightly-dry side for 1–2 weeks while the disturbed roots recover.

No reported toxicity. Considered safe for incidental contact.

ASPCA lists Stromanthe as non-toxic to cats. No expected oral or systemic effects from chewing.

ASPCA lists Stromanthe as non-toxic to dogs. No expected oral or systemic effects from chewing.