Fertilising guide
How to fertilise Mauna Loa Peace Lily (Spathiphyllum 'Mauna Loa')— schedule & NPK
Also called Mauna Loa Peace Lily, Peace Lily, Mauna Loa Spathiphyllum.
More about mauna loa peace lily
About Mauna Loa Peace Lily
Spathiphyllum 'Mauna Loa' · also called Mauna Loa Peace Lily, Peace Lily · houseplant
Spathiphyllum 'Mauna Loa' is a popular large-growing peace lily cultivar prized for its glossy dark-green leaves and abundant white spathes. It tolerates low light better than most flowering houseplants, purifies indoor air, and blooms reliably with minimal care. Keep soil consistently moist and avoid cold draughts for best results.
Growth habit: Clump-forming, upright rosette
Watch for — Brown leaf tips: Most commonly caused by low humidity, fluoride in tap water, or over-fertilising. Switch to filtered or rainwater, increase humidity, and flush the soil every few months to remove salt build-up.
What fertiliser mauna loa peace lily actually wants — and why
Mauna Loa Peace Lily 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 mauna loa peace lily: 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 mauna loa peace lily, 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 mauna loa peace lily:
Feed monthly from spring through summer with a balanced liquid fertiliser diluted to half strength. Reduce to every 6–8 weeks in autumn and withhold entirely in winter. Over-fertilising causes brown leaf tips and salt build-up. Treat that as monthly 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 mauna loa peace lily 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 mauna loa peace lily
Half strength is the safe default for mauna loa peace lily — 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 mauna loa peace lily first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the mauna loa peace lily watering schedule.
Signs you are over-feeding mauna loa peace lily
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for mauna loa peace lily:
- 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 mauna loa peace lily
- 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 mauna loa peace lily care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of mauna loa peace lily 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 mauna loa peace lily
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 mauna loa peace lily — frequently asked questions
What fertiliser does mauna loa peace lily 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. Mauna Loa Peace Lily 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 mauna loa peace lily?
Feed monthly from spring through summer with a balanced liquid fertiliser diluted to half strength. Reduce to every 6–8 weeks in autumn and withhold entirely in winter. Over-fertilising causes brown leaf tips and salt build-up. Feed monthly from spring through summer with a balanced liquid fertiliser diluted to half strength. Reduce to every 6–8 weeks in autumn and withhold entirely in winter. Over-fertilising causes brown leaf tips and salt build-up. Treat that as monthly 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 mauna loa peace lily?
Half strength is the safe default for mauna loa peace lily — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding mauna loa peace lily 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 mauna loa peace lily 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 mauna loa peace lily?
Flush the pot of mauna loa peace lily 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
- Mauna Loa Peace Lily care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water mauna loa peace lily — 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 peperomia axillaris
- How to fertilise peperomia glabella
- How to fertilise peperomia glabella 'variegata'
- All 8452 fertilising guides in the Growli library