Fertilising guide
How to fertilise Aglaonema Rotundum (Aglaonema rotundum)— schedule & NPK
Also called Round-Leaf Aglaonema, Red Aglaonema Species.
More about aglaonema rotundum
About Aglaonema Rotundum
Aglaonema rotundum · also called Round-Leaf Aglaonema, Red Aglaonema Species · houseplant
Aglaonema rotundum is a true species from Sumatra with dramatic, near-black rounded leaves veined in vivid pink to red. Unlike hybrid cultivars, it demands warmth, steady humidity, and gentle care to maintain its colour. A collector's Chinese evergreen, it is more sensitive than common Aglaonemas but rewards attentive growers with arresting dark foliage.
Growth habit: Slow-growing, clump-forming species with a compact rosette of broad, rounded leaves held on short petioles.
What fertiliser aglaonema rotundum actually wants — and why
Aglaonema Rotundum 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 aglaonema rotundum: 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 aglaonema rotundum, 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 aglaonema rotundum:
Feed at quarter to half strength with a balanced liquid fertiliser every 3-4 weeks during spring and summer. This species is sensitive to fertiliser salts, so dilute well and rest it in 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 aglaonema rotundum 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 aglaonema rotundum
Half strength every feed is the sweet spot for aglaonema rotundum: 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 aglaonema rotundum first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the aglaonema rotundum watering schedule.
Signs you are over-feeding aglaonema rotundum
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for aglaonema rotundum:
- 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 aglaonema rotundum
- 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 aglaonema rotundum 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 aglaonema rotundum 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 aglaonema rotundum
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 aglaonema rotundum — frequently asked questions
What fertiliser does aglaonema rotundum 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. Aglaonema Rotundum 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 aglaonema rotundum?
Feed at quarter to half strength with a balanced liquid fertiliser every 3-4 weeks during spring and summer. This species is sensitive to fertiliser salts, so dilute well and rest it in winter. Feed at quarter to half strength with a balanced liquid fertiliser every 3-4 weeks during spring and summer. This species is sensitive to fertiliser salts, so dilute well and rest it in 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 aglaonema rotundum?
Half strength every feed is the sweet spot for aglaonema rotundum: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
What does over-feeding aglaonema rotundum 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 aglaonema rotundum?
Because you feed often, salts accumulate faster — flush the pot of aglaonema rotundum with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Keep reading
- Aglaonema Rotundum care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water aglaonema rotundum — 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 3899 fertilising guides in the Growli library