Repotting guide

When & how to repot Fishbone Prayer Plant (Ctenanthe burle-marxii)

Also called Fishbone Prayer Plant, Burle Marx Calathea, Fishbone Calathea, Never Never Plant.

More about fishbone prayer plant

About Fishbone Prayer Plant

Ctenanthe burle-marxii · also called Fishbone Prayer Plant, Burle Marx Calathea · houseplant

The Fishbone Prayer Plant (Ctenanthe burle-marxii) is a compact Marantaceae foliage houseplant prized for silvery leaves with herringbone markings that fold up at night. It wants bright indirect light, consistently moist soil, and high humidity. Not individually ASPCA-listed, so treat as a verify-with-vet plant rather than confirmed pet-safe.

Mature size: Indoors typically around 30-50 cm (12-20 in) tall and roughly 40 cm (16 in) wide; RHS gives an ultimate height of 0.5-1 m and spread of 0.1-0.5 m over 5-10 years.

Watch for — Yellowing leaves: Usually overwatering or soggy, poorly drained soil; can also follow cold draughts. Let the top inch dry between waterings and ensure the pot drains freely.

How to tell fishbone prayer plant needs repotting

Repotting on a calendar is less reliable than reading the plant. For fishbone prayer plant, watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for fishbone prayer plant) flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot fishbone prayer plant

Only every 2–4 years, when genuinely crowded. Fishbone Prayer Plant is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Herbaceous evergreen perennial with an upright, clumping, bushy habit. New leaves emerge from the base, and the foliage raises and folds at night (the "prayer plant" nyctinastic movement), then reopens by day. Slow to moderate grower..

What size pot to step fishbone prayer plant up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Fishbone Prayer Plant positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping fishbone prayer plant into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot fishbone prayer plant

Early spring, just as new growth restarts, is the ideal window for fishbone prayer plant. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting fishbone prayer plant

Confirm it actually needs it. Slide fishbone prayer plant out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip fishbone prayer plant out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh rich, moisture-retentive but free-draining potting mix, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water fishbone prayer plant again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for fishbone prayer plant

Fishbone Prayer Plant wants rich, moisture-retentive but free-draining potting mix. Use a peat-free, loam-based mix amended for drainage, e.g. quality potting compost with added coir or peat substitute plus a little perlite or coarse sand. It tolerates acidic, neutral, or alkaline pH but resents soggy, compacted soil. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting fishbone prayer plant — frequently asked questions

How often should you repot fishbone prayer plant?

Only every 2–4 years, when genuinely crowded for fishbone prayer plant. Only repot fishbone prayer plant every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using rich, moisture-retentive but free-draining potting mix. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does fishbone prayer plant need?

When is the best time of year to repot fishbone prayer plant?

Does fishbone prayer plant like to be root-bound?

Yes — fishbone prayer plant genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise fishbone prayer plant after repotting?

Not immediately. Wait about 4 weeks after repotting fishbone prayer plant. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.