Fertilising guide
How to fertilise Monstera (Monstera deliciosa)— schedule & NPK
Also called Swiss cheese plant, Mexican breadfruit, split-leaf philodendron.
About Monstera
Monstera deliciosa · also called Swiss cheese plant, Mexican breadfruit · tropical
Monstera is a climbing tropical aroid from Central American rainforests. Indoors it wants bright indirect light, chunky aroid mix, and a moss pole to develop its famous fenestrated leaves. Water when the top 2-3 cm of soil is dry. It is mildly toxic to cats and dogs because of insoluble calcium oxalates.
Monstera deliciosa is native to the tropical rainforests of southern Mexico through Central America to Panama, where it grows as a hemiepiphyte: it germinates on the floor then climbs tree trunks with aerial roots toward the canopy light.
RHS advises a balanced liquid fertiliser applied monthly only while in active growth, with feeding withheld over winter when the plant is largely dormant.
Growth habit: Climbing evergreen vine — will trail or climb a support
Sources: rhs.org.uk, missouribotanicalgarden.org, digitalcommons.usf.edu
What fertiliser monstera actually wants — and why
Monstera 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 monstera: 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 monstera, 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 monstera:
Balanced liquid feed at half strength every 4 weeks from spring to early autumn; skip in winter. For a fast grower like this that means feeding regularly — about every 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 monstera 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 monstera
Half strength every feed is the sweet spot for monstera: 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 monstera first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the monstera watering schedule.
Signs you are over-feeding monstera
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for monstera:
- 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 monstera
- 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 monstera 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 monstera 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 monstera
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 monstera — frequently asked questions
What fertiliser does monstera 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. Monstera 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 monstera?
Balanced liquid feed at half strength every 4 weeks from spring to early autumn; skip in winter. Balanced liquid feed at half strength every 4 weeks from spring to early autumn; skip in winter. For a fast grower like this that means feeding regularly — about every 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 monstera?
Half strength every feed is the sweet spot for monstera: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
What does over-feeding monstera 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 monstera?
Because you feed often, salts accumulate faster — flush the pot of monstera with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Keep reading
- Monstera care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water monstera — 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 pothos
- How to fertilise fiddle leaf fig
- How to fertilise philodendron
- All 200 fertilising guides in the Growli library