Fertilising guide
How to fertilise Rotala macrandra (Rotala macrandra)— schedule & NPK
Also called giant red Rotala, broadleaf Rotala.
More about rotala macrandra
About Rotala macrandra
Rotala macrandra · also called giant red Rotala, broadleaf Rotala · tropical
A striking high-tech aquascaping stem plant with broad, ruffled leaves that turn deep pink to fiery red. More demanding than common rotalas, it needs strong light, stable CO2 and lean dosing to avoid stunting. A showpiece background or midground plant for experienced aquarists who can hold consistent water parameters.
Growth habit: Upright branching stem plant with broad opposite leaves, forming a bold red bush; moderate growth rate that slows and stunts if parameters shift.
Watch for — Stunted, deformed new tips: The classic macrandra problem, caused by CO2 swings or micronutrient shortfall. Stabilise CO2 across the full photoperiod and ensure adequate magnesium, calcium and trace elements.
What fertiliser rotala macrandra actually wants — and why
Rotala macrandra is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root 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 rotala macrandra: 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 rotala macrandra, 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 rotala macrandra:
Dose a complete macro and micro fertiliser regimen with emphasis on iron and trace elements for red intensity; keep nitrate lean. Consistency matters more than dose size, as macrandra stunts under fluctuating nutrients or CO2. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when rotala macrandra 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 rotala macrandra
Half strength is the safe default for rotala macrandra — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water rotala macrandra first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the rotala macrandra watering schedule.
Signs you are over-feeding rotala macrandra
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for rotala macrandra:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding rotala macrandra
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full rotala macrandra care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of rotala macrandra with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for rotala macrandra
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 rotala macrandra — frequently asked questions
What fertiliser does rotala macrandra need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Rotala macrandra is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed rotala macrandra?
Dose a complete macro and micro fertiliser regimen with emphasis on iron and trace elements for red intensity; keep nitrate lean. Consistency matters more than dose size, as macrandra stunts under fluctuating nutrients or CO2. Dose a complete macro and micro fertiliser regimen with emphasis on iron and trace elements for red intensity; keep nitrate lean. Consistency matters more than dose size, as macrandra stunts under fluctuating nutrients or CO2. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for rotala macrandra?
Half strength is the safe default for rotala macrandra — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding rotala macrandra look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding rotala macrandra year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of rotala macrandra?
Flush the pot of rotala macrandra with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Rotala macrandra care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water rotala macrandra — 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 monstera
- How to fertilise pothos
- How to fertilise fiddle leaf fig
- All 5561 fertilising guides in the Growli library