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Fertilising guide

How to fertilise Peacock Plant (Calathea makoyana)— schedule & NPK

Also called Peacock Plant, Cathedral Windows, Brain Plant, Goeppertia makoyana.

More about peacock plant

About Peacock Plant

Calathea makoyana · also called Peacock Plant, Cathedral Windows · houseplant

Calathea makoyana (syn. Goeppertia makoyana) is a Brazilian rainforest prayer plant famed for translucent leaves painted with dark ovals on pale green, with deep purple undersides visible as the leaves fold upward at night. High humidity above 60 percent and soft, room-temperature water are its non-negotiable requirements. Pet-safe per the ASPCA.

Growth habit: Clumping, evergreen perennial with an upright, bushy habit spreading slowly from underground rhizomes. New leaves emerge rolled and unfurl from the centre; foliage performs nyctinasty, rising and folding upward at night to reveal purple-red undersides.

Watch for — Faded or scorched patterning: Direct sun bleaches and burns the patterned foliage. Move to bright but indirect or filtered light to restore colour contrast.

What fertiliser peacock plant actually wants — and why

Peacock Plant 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 peacock plant: 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 peacock plant, 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 peacock plant:

Feed every 2-4 weeks during spring and summer with a balanced liquid houseplant fertiliser diluted to roughly half strength. Stop or greatly reduce feeding in autumn and winter. Sensitive to fertiliser salt build-up, so flush the compost with clean water occasionally; never over-feed, which scorches leaf tips. Treat that as every 2-4 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 peacock plant 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 peacock plant

Half strength is the safe default for peacock plant — 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 peacock plant first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the peacock plant watering schedule.

Signs you are over-feeding peacock plant

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for peacock plant:

Signs you are under-feeding peacock plant

If the symptoms point at watering, light or roots rather than nutrition, the full peacock plant care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of peacock plant 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 peacock plant

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 peacock plant — frequently asked questions

What fertiliser does peacock plant 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. Peacock Plant 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 peacock plant?

Feed every 2-4 weeks during spring and summer with a balanced liquid houseplant fertiliser diluted to roughly half strength. Stop or greatly reduce feeding in autumn and winter. Sensitive to fertiliser salt build-up, so flush the compost with clean water occasionally; never over-feed, which scorches leaf tips. Feed every 2-4 weeks during spring and summer with a balanced liquid houseplant fertiliser diluted to roughly half strength. Stop or greatly reduce feeding in autumn and winter. Sensitive to fertiliser salt build-up, so flush the compost with clean water occasionally; never over-feed, which scorches leaf tips. Treat that as every 2-4 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 peacock plant?

Half strength is the safe default for peacock plant — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding peacock plant 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 peacock plant 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 peacock plant?

Flush the pot of peacock plant 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.

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