Fishbone Prayer Plant
Also known as
Fishbone Ctenanthe, Ctenanthe burle-marxii, Calathea Fishbone (mislabel), Amagris Prayer Plant
Keep this plant’s care guide close at hand.
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Ctenanthe burle-marxii is a clump-forming, rhizomatous member of the Marantaceae native to Brazil’s Atlantic Forest understory. It is prized for its striking, low-growing foliage: elongated, oval leaves with a cool, blue‑green to silvery surface marked by dark green herringbone bands that resemble fish bones. Leaf undersides are pale green on the species, while the cultivar ‘Amagris’ shows a silvery top with faint markings and a soft mauve tint beneath. Like other “prayer plants,” its leaves exhibit nyctinasty, lifting in the evening and relaxing by day. Mature plants typically reach 30–50 cm in height and spread slowly via short rhizomes, forming dense, decorative clumps. In cultivation it prefers consistently warm, humid conditions, gentle watering with soft, tepid water, and bright, filtered light. It is sensitive to cold, dry air, and mineral buildup, which can cause crispy margins or tip burn. Named in honor of Brazilian landscape architect Roberto Burle Marx, this species is a refined, compact choice for indoor tropical displays, terraria, or protected patios in frost‑free climates.
Taxonomy
Properties & Requirements
How to care for Fishbone Prayer Plant
Water
Keep the root zone evenly moist but never waterlogged. Let the top 1–2 cm of mix dry, then water thoroughly until 10–20% drains; discard runoff. Use tepid, low‑mineral water to prevent tip burn. Reduce frequency in winter as growth slows. Bottom‑watering is useful occasionally to hydrate evenly, but allow excess to drain. Signs of overwatering include yellowing leaves and limp petioles; crispy margins and leaf curl indicate underwatering or low humidity.
Light
Provide bright, filtered light—an east window or a few feet back from a bright south window behind sheer curtains is ideal. It tolerates medium light but grows more slowly and may lose contrast. Avoid direct midday sun, which bleaches and scorches foliage. Under LED grow lights, 10–12 hours of soft, indirect intensity works well. Washed‑out leaves suggest too much light; elongated petioles and dull color suggest too little.
Nutrients
Feed during active growth (spring–summer) every 4–6 weeks with a balanced, urea‑lean fertilizer at 1/4–1/2 strength (e.g., 3‑1‑2 or 10‑10‑10). Skip or halve feeding in autumn–winter. Marantaceae are salt‑sensitive: flush the pot with plain water every 2–3 months to prevent buildup, and avoid slow‑release pellets that are too strong. A light top‑dress of worm castings in spring is beneficial. Never fertilize a drought‑stressed or freshly repotted plant.
Temperature
Best between 18–27°C (65–80°F) with stable, draft‑free conditions. Avoid temperatures below 15°C (59°F); brief dips can stunt growth and spot leaves. Keep away from heaters and air‑conditioner blasts that cause rapid drying. Provide slightly warmer days and marginally cooler nights to mimic tropical understory conditions. In cooler months, reduce watering and feeding proportionally while maintaining humidity to prevent edge crisping.
