Ctenanthe Burle Marxii

How to care for Ctenanthe Burle Marxii

Light

Ctenanthe burle-marxii thrives in bright, indirect light. A position near an east- or north-facing window in the UK is often ideal, or set back from a south- or west-facing window to avoid direct sun, which will scorch and bleach the patterned foliage. Low light is tolerated to a degree but will cause the markings to fade and growth to slow considerably.

Watering

Water with room-temperature, low-fluoride water whenever the top centimetre of the compost feels just dry to the touch. This plant dislikes both drought and waterlogging; consistently wet roots will lead to root rot, while allowing it to dry out causes leaf curl and brown edges. Rainwater or filtered water is preferable to tap water where fluoride and chlorine levels are high, as this species is sensitive to mineral build-up.

Soil and potting

Use a well-draining yet moisture-retentive compost. A suitable mix might combine two parts peat-free houseplant compost with one part perlite and one part fine bark or coir to ensure good aeration and drainage. A slightly acidic to neutral pH of around 6.0 to 7.0 is appropriate. Avoid heavy or compacted soils that hold excess water around the roots.

Feeding

Apply a diluted balanced liquid fertiliser at half the recommended strength every two to four weeks during spring and summer. Reduce feeding to once monthly in autumn and cease entirely in winter when the plant is not actively growing. Over-fertilising can cause salt build-up and tip burn, so flushing the pot through with water every few months is advisable.

Humidity and temperature

This species requires consistently high humidity, ideally above 60%, to maintain leaf condition and prevent brown leaf margins. Grouping plants together, placing the pot on a tray of damp pebbles, or using a room humidifier are all effective approaches. Misting directly onto the foliage can encourage fungal issues and is not recommended. Keep the plant in temperatures between 16 and 27 C and away from cold draughts, radiators, and air-conditioning units.

Repotting

Repot every one to two years in spring when the roots begin to circle the base of the pot or emerge from the drainage holes. Choose a pot only one or two sizes larger than the current one, as an overly large container retains excess moisture and raises the risk of root rot. Terracotta pots can help regulate soil moisture but require more frequent watering than plastic or ceramic alternatives.

Pruning

Pruning requirements are minimal. Remove any yellowed, damaged, or dead leaves at the base with clean scissors or secateurs to maintain the plant's appearance and direct energy into healthy growth. Do not remove more than one-third of the foliage at once. Trimming spent flower stalks, if the plant flowers indoors, will keep the plant looking tidy.

Is Ctenanthe Burle Marxii toxic?

Common problems

How to propagate

Division

The most reliable method is to divide the rhizome at repotting time in spring. Separate the plant into sections, each with a healthy stem and a portion of root, and pot each division into its own container with fresh compost.

Stem cuttings

Take a cutting just below a leaf node, retaining one or two leaves, and place it in a glass of water or moist propagation mix in a warm, humid environment. Roots should develop within four to eight weeks, after which the cutting can be transferred to compost.

Where Ctenanthe Burle Marxii comes from

Native to south-eastern Brazil, Atlantic Forest region of Brazil.

Story and origins

The genus name Ctenanthe is derived from the ancient Greek words 'kteis' (meaning comb) and 'anthos' (meaning flower), referring to the comb-like arrangement of the bracts surrounding the flowers. The species epithet 'burle-marxii' is a Latinised form of the name of Roberto Burle Marx (1909 to 1994), the pioneering Brazilian landscape architect, artist, and botanist who championed the use of native Brazilian flora in designed landscapes and was instrumental in collecting and propagating many species from the Atlantic Forest.

Roberto Burle Marx was among the first landscape designers to systematically seek out and promote native Brazilian plants, including members of the Marantaceae family, at a time when tropical garden design was dominated by imported species. Ctenanthe burle-marxii was formally described in the mid-twentieth century and was named to honour his contribution to Brazilian botany and horticulture. The species became popular in European and North American houseplant collections from the latter decades of the twentieth century, valued for the ornamental quality of its foliage and its relative compactness compared with larger Marantaceae relatives.

Varieties to know

Ctenanthe burle-marxii 'Amagris'

A popular cultivar with pale silvery-grey leaf surfaces and darker green herringbone markings; among the most widely available forms in cultivation.

Fun facts

• The plant is named in honour of the celebrated Brazilian landscape architect Roberto Burle Marx, who is credited with introducing many native Brazilian plants into ornamental horticulture.
• Like all prayer plants in the Marantaceae family, Ctenanthe burle-marxii moves its leaves through nyctinasty, a rhythmic folding motion driven by changes in light rather than touch.
• The mechanism behind leaf movement in Marantaceae involves specialised cells in a structure called the pulvinus at the base of each petiole, which change their water pressure in response to light cues.
• Ctenanthe is closely related to Calathea and Stromanthe; many plants formerly sold under the Calathea name have been reclassified into the Goeppertia genus, yet Ctenanthe remains a separate genus.
• In its native Brazilian Atlantic Forest habitat, which is one of the world's most biodiverse and threatened ecosystems, this species grows as a low-level understorey plant in dappled shade.

Ctenanthe Burle Marxii FAQ