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Fertilising guide

How to fertilise Pilea pumila (Pilea pumila)— schedule & NPK

Also called clearweed, coolwort, richweed.

More about pilea pumila

About Pilea pumila

Pilea pumila · also called clearweed, coolwort · houseplant

Pilea pumila, or clearweed, is a soft annual native to North America and Asia, named for its translucent, almost see-through green stems and toothed, nettle-shaped leaves that sting nobody. A shade-loving woodland herb more often found wild than potted, it suits cool, moist, semi-shaded spots and self-seeds readily. It is harmless and pet-safe.

Growth habit: An upright to sprawling soft-stemmed annual that branches freely and self-seeds prolifically, often forming dense colonies. The succulent, translucent stems are brittle and watery.

What fertiliser pilea pumila actually wants — and why

Pilea pumila 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 pilea pumila: 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 pilea pumila, 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 pilea pumila:

Rarely needs feeding in fertile woodland soil. If grown in containers, a light feed of dilute balanced liquid fertiliser once a month during active growth is plenty. As a short-lived annual it does not require sustained feeding. Treat that as once a month 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 pilea pumila 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 pilea pumila

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

Signs you are over-feeding pilea pumila

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

Signs you are under-feeding pilea pumila

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

Flushing and leaching the salts

Flush the pot of pilea pumila 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 pilea pumila

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 pilea pumila — frequently asked questions

What fertiliser does pilea pumila 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. Pilea pumila 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 pilea pumila?

Rarely needs feeding in fertile woodland soil. If grown in containers, a light feed of dilute balanced liquid fertiliser once a month during active growth is plenty. As a short-lived annual it does not require sustained feeding. Rarely needs feeding in fertile woodland soil. If grown in containers, a light feed of dilute balanced liquid fertiliser once a month during active growth is plenty. As a short-lived annual it does not require sustained feeding. Treat that as once a month 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 pilea pumila?

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

What does over-feeding pilea pumila 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 pilea pumila 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 pilea pumila?

Flush the pot of pilea pumila 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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