Ctenanthe burle-marxii

A fishbone-patterned plant from Brazil’s Atlantic Forest

Ctenanthe burle-marxii is a rhizomatous member of the prayer-plant family, native to Espírito Santo in southeastern Brazil. Its pale leaves and dark fishbone markings rise from creeping underground stems that gradually form colonies.

In the Atlantic Forest it belongs to the lower vegetation below a layered canopy. The air is warm and humid, rain falls regularly and leaves overhead break up direct sunlight.

Rich litter covers the ground and holds moisture around shallow roots. The broad blades can change angle through the day, a family trait linked to specialised joints at the base of each leaf.

Care for humidity-sensitive foliage

Dividing only well-rooted fishbone shoots

Repot Ctenanthe burle-marxii when rhizomes press against the rim, roots fill the drainage area, the mix dries unusually fast or its centre compacts. Keep the shallow root ball together unless dividing, and separate only natural rhizome sections that have roots and several shoots.

Roots and substrate

Water when the upper layer of the substrate has dried and the shallow roots below are still lightly moist. Its compact spreading clump dries more quickly in bright warmth or a root-filled shallow pot.

Light

Place the Fishbone Prayer Plant near an east or north-east window, or a short distance from a brighter south or west window. In low light, new leaves become smaller, the fishbone markings lose contrast and the spreading clump opens; the leaves also turn strongly towards the window.

Temperature and draughts

Cold glass, tiled sills and winter ventilation can roll or mark foliage before the room feels cold.

Feeding leaves and spreading rhizomes

Feed the plant at a low dose while leaves and rhizomes are developing. Strong feed does not sharpen the markings and often appears first as dry edges.

Support

This naturally spreading plant needs no stake. Rotate Ctenanthe burle-marxii gradually after a new leaf hardens; moving it while the leaf is still rolled can redirect or crease it.

Problems and solutions for Ctenanthe burle-marxii

The fishbone leaves lift or fold in the evening

This prayer-plant movement is normal when leaves rise and lower again with the daily light cycle. A problem is more likely if they remain tightly rolled, limp or unchanged through the day. Check root moisture, temperature and the tender leaf joints before assuming ordinary night movement is wilting.

Silvery-green leaves curl with brown margins

Curling on a dry root ball points to insufficient water; the same symptom above wet mix can mean chilled or damaged roots. Feel deeper and inspect roots if needed before changing watering. Keep the plant warm and out of direct sun. Existing brown margins will not flatten or recolour.

The low fishbone clump becomes open in the middle

This species spreads by rhizomes and can direct new shoots towards the brighter side of the pot. Turn it gradually and check for living buds at the centre. Old empty sections can be divided away during active growth. A soft, sour-smelling rhizome is very likely decaying. Remove the affected section promptly, leaving firm, clean tissue.

Several leaves yellow while the mix stays wet

Persistent saturation reduces air around the fine roots and rhizomes. Unpot the plant, remove brown collapsing roots and repot the firm divisions in an airy mix. One old yellow leaf is not an emergency; yellowing that reaches new fishbone leaves or is paired with a soft rhizome needs faster action.

Ctenanthe burle-marxii is non-toxic to pets

• Ctenanthe burle-marxii is non-toxic to cats and dogs.
• No specific toxic principle is recognised for this plant.
• Eating a large amount of plant material may still cause temporary digestive upset.

Comb flower and Brazilian landscape architect Roberto Burle Marx

Ctenanthe combines Greek kteis, meaning comb, with anthos, meaning flower. The epithet burle-marxii honours Brazilian landscape architect Roberto Burle Marx and preserves his full surname in hyphenated form.