Fertilising guide
How to fertilise Calathea Bacillaris (Goeppertia bacillaris)— schedule & NPK
Also called reed-stem calathea, bacillaris calathea.
More about calathea bacillaris
About Calathea Bacillaris
Goeppertia bacillaris · also called reed-stem calathea, bacillaris calathea · houseplant
A slender reed-stem prayer plant with narrow, elongated mid-green leaves carried on thin upright stalks, giving an airy, grass-like clump. Less common in cultivation, it shares the calathea need for warmth, even moisture and high humidity, and reacts to hard water. It stays compact, folds its leaves at night, and is non-toxic to pets.
Growth habit: Clumping, upright reed-stem foliage plant with narrow leaves on slim stalks, forming an airy tuft; folds its leaves upward at night.
What fertiliser calathea bacillaris actually wants — and why
Calathea Bacillaris is a genuinely hungry tropical — in bright warmth it pushes growth fast and rewards a regular half-strength balanced feed all season.
A balanced liquid feed (even N-P-K) or a slightly nitrogen-leaning foliage feed — this is a big-leaved foliage plant putting on real size, so it wants steady nitrogen for lush leaves, not a bloom formula.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for calathea bacillaris: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed calathea bacillaris, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For calathea bacillaris:
Feed every 3-4 weeks in spring and summer with a balanced houseplant fertiliser at half strength. Flush the soil occasionally to prevent salt build-up, and stop feeding in autumn and winter. For a fast grower like this that means feeding regularly — about every 3-4 weeks — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.
The dormant-season rule matters more than the exact interval: skip feeding entirely when calathea bacillaris is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for calathea bacillaris
Half strength every feed is the sweet spot for calathea bacillaris: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
Feeding always goes onto already-damp soil, never dry roots — water calathea bacillaris first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the calathea bacillaris watering schedule.
Signs you are over-feeding calathea bacillaris
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for calathea bacillaris:
- Brown, scorched leaf tips and margins despite correct watering.
- A white salt crust on the soil or around the pot edge.
- Sudden leaf yellowing and drop shortly after a strong feed.
- Soft, weak, over-stretched growth that cannot support itself.
Signs you are under-feeding calathea bacillaris
- New leaves coming in noticeably smaller than older ones.
- Pale, yellow-green older leaves and slow growth through peak summer.
- A general loss of vigour and gloss in a plant that should be racing away.
If the symptoms point at watering, light or roots rather than nutrition, the full calathea bacillaris care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Because you feed often, salts accumulate faster — flush the pot of calathea bacillaris with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Organic vs synthetic feeds for calathea bacillaris
Organic options
A diluted seaweed or fish-and-seaweed feed plus a yearly top-dress of worm castings supports fast growth without burn risk. UK: Westland seaweed or Baby Bio Organic; US: Neptune's Harvest or Espoma Indoor!.
Synthetic / liquid feeds
A balanced houseplant liquid at half strength applied frequently — UK: Baby Bio, Phostrogen or Westland Houseplant Feed; US: Miracle-Gro Indoor Plant Food or Dyna-Gro Foliage-Pro for steady leafy growth.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising calathea bacillaris — frequently asked questions
What fertiliser does calathea bacillaris need?
A balanced liquid feed (even N-P-K) or a slightly nitrogen-leaning foliage feed — this is a big-leaved foliage plant putting on real size, so it wants steady nitrogen for lush leaves, not a bloom formula. Calathea Bacillaris is a genuinely hungry tropical — in bright warmth it pushes growth fast and rewards a regular half-strength balanced feed all season.
How often should I feed calathea bacillaris?
Feed every 3-4 weeks in spring and summer with a balanced houseplant fertiliser at half strength. Flush the soil occasionally to prevent salt build-up, and stop feeding in autumn and winter. Feed every 3-4 weeks in spring and summer with a balanced houseplant fertiliser at half strength. Flush the soil occasionally to prevent salt build-up, and stop feeding in autumn and winter. For a fast grower like this that means feeding regularly — about every 3-4 weeks — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.
What strength of feed for calathea bacillaris?
Half strength every feed is the sweet spot for calathea bacillaris: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
What does over-feeding calathea bacillaris look like?
Brown, scorched leaf tips and margins despite correct watering. A white salt crust on the soil or around the pot edge. Sudden leaf yellowing and drop shortly after a strong feed. Soft, weak, over-stretched growth that cannot support itself. The mistake here is the opposite of most houseplants: under-feeding a fast tropical in peak season starves it, leaving small, pale new leaves and slow growth — but full-strength doses still burn it, so feed often and weak, not occasionally and strong.
Should I flush the soil of calathea bacillaris?
Because you feed often, salts accumulate faster — flush the pot of calathea bacillaris with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Keep reading
- Calathea Bacillaris care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water calathea bacillaris — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise snake plant
- How to fertilise dracaena
- How to fertilise peperomia
- All 2464 fertilising guides in the Growli library