Fertilising guide
How to fertilise Fragrant Peace Lily (Spathiphyllum cochlearispathum)— schedule & NPK
Also called Fragrant Peace Lily, Large Peace Lily, Mexican Peace Lily, Cochlearispathum Peace Lily.
More about fragrant peace lily
About Fragrant Peace Lily
Spathiphyllum cochlearispathum · also called Fragrant Peace Lily, Large Peace Lily · houseplant
Spathiphyllum cochlearispathum is a large-growing peace lily from Mexico and Central America, notable for strongly scented white spathes. It tolerates lower light than most houseplants, wilts dramatically when thirsty, and recovers quickly once watered. Like all peace lilies, it is toxic to cats and dogs due to insoluble calcium oxalate crystals.
Growth habit: Large, clump-forming evergreen perennial. Broad, lance-shaped, deeply veined leaves arise directly from the base on long petioles. Flowers are white spathes on upright stems, strongly fragrant. Spreads by offsets to form a dense clump.
Watch for — Brown leaf tips and margins: Caused by low humidity, fluoride or mineral build-up from tap water, or over-fertilising. Raise humidity, use filtered water, and dilute any fertiliser to half strength.
What fertiliser fragrant peace lily actually wants — and why
Fragrant 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 fragrant 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 fragrant 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 fragrant peace lily:
Feed every 4-6 weeks during spring and summer with a balanced, dilute liquid fertiliser at half strength. Over-feeding causes brown leaf-tip burn from salt build-up; flush the soil with water occasionally and reduce or stop feeding in autumn and winter when growth slows. Treat that as every 4-6 weeks 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 fragrant 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 fragrant peace lily
Half strength is the safe default for fragrant 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 fragrant 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 fragrant peace lily watering schedule.
Signs you are over-feeding fragrant peace lily
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for fragrant 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 fragrant 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 fragrant peace lily care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of fragrant 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 fragrant 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 fragrant peace lily — frequently asked questions
What fertiliser does fragrant 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. Fragrant 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 fragrant peace lily?
Feed every 4-6 weeks during spring and summer with a balanced, dilute liquid fertiliser at half strength. Over-feeding causes brown leaf-tip burn from salt build-up; flush the soil with water occasionally and reduce or stop feeding in autumn and winter when growth slows. Feed every 4-6 weeks during spring and summer with a balanced, dilute liquid fertiliser at half strength. Over-feeding causes brown leaf-tip burn from salt build-up; flush the soil with water occasionally and reduce or stop feeding in autumn and winter when growth slows. Treat that as every 4-6 weeks 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 fragrant peace lily?
Half strength is the safe default for fragrant 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 fragrant 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 fragrant 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 fragrant peace lily?
Flush the pot of fragrant 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
- Fragrant Peace Lily care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water fragrant 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 drosera burmanni
- How to fertilise pinguicula agnata
- How to fertilise pinguicula laueana
- All 6887 fertilising guides in the Growli library