About Stromanthe
Stromanthe is a genus of around 13 species of tropical perennials native to the rainforests of Central and South America, particularly Brazil. They belong to the Marantaceae family, making them close relatives of Calathea, Maranta, and Ctenanthe. The most popular houseplant variety is Stromanthe sanguinea 'Triostar', celebrated for its dramatic variegated foliage: dark green, cream, and white on the upper surface with a vivid magenta-pink underside that becomes visible when the leaves fold up at night.
Light Requirements
Bright, indirect light produces the most vivid variegation. Too little light causes the colourful markings to fade, with new leaves emerging predominantly green. Too much direct sun bleaches the leaves and causes brown scorch marks. An east or west-facing position with good ambient brightness is ideal. Avoid dark corners.
Watering
Keep the compost consistently moist during spring and summer, but never waterlogged. Allow the top centimetre to dry slightly before watering again. Stromanthe is sensitive to both drought (which causes leaf curl) and overwatering (which causes root rot and yellowing). Use room-temperature water, as cold water can cause leaf spotting.
Humidity
High humidity is important for stromanthe. Low humidity causes leaf edges to brown and curl. Mist the leaves regularly with a fine mist, place on a pebble tray filled with water, or use a humidifier nearby. A bathroom or kitchen with natural light can be an excellent location. Avoid positioning near radiators or air conditioning vents.
Temperature
Stromanthe prefers temperatures of 18-26 degrees C and dislikes cold draughts and temperatures below 15 degrees C. Avoid placing near exterior doors, cold windowsills, or heating vents. Stable warmth produces the most consistent growth.
Feeding and Repotting
Feed monthly during spring and summer with a balanced liquid fertiliser at half strength. Repot every 1-2 years in spring when roots begin to escape the pot. Use a moisture-retentive, peat-free compost with good drainage. Avoid disturbing the roots more than necessary.
Nyctinasty
Like all Marantaceae, stromanthe leaves fold upward in the evening and open again in the morning, a movement known as nyctinasty or the prayer movement. This is healthy, natural behaviour and one of the most appealing characteristics of the plant. If leaves remain folded during the day, this may indicate insufficient light or low temperatures.
