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Fertilising guide

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

Also called Moon Valley pilea, artillery plant, hairy pilea.

More about pilea mollis

About Pilea mollis

Pilea mollis · also called Moon Valley pilea, artillery plant · houseplant

Pilea mollis 'Moon Valley' is a bushy, soft-stemmed plant grown for its deeply textured, quilted, lime-and-bronze leaves resembling a lunar surface. A fast tropical grower in the nettle family, it forms a mounded clump. It wants bright indirect light, consistently lightly moist soil, warmth, and higher humidity, and it is non-toxic to cats and dogs.

Growth habit: Bushy and mounding, with soft upright-to-spreading stems; fast-growing and prone to legginess, benefitting from regular pinching.

What fertiliser pilea mollis actually wants — and why

Pilea mollis 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 mollis: 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 mollis, 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 mollis:

Feed every 2-4 weeks in spring and summer with a balanced liquid houseplant fertiliser at half strength to support its fast growth. Reduce to roughly monthly or stop in autumn and winter when growth slows. 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 pilea mollis 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 mollis

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

Signs you are over-feeding pilea mollis

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

Signs you are under-feeding pilea mollis

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

Flushing and leaching the salts

Flush the pot of pilea mollis 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 mollis

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 mollis — frequently asked questions

What fertiliser does pilea mollis 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 mollis 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 mollis?

Feed every 2-4 weeks in spring and summer with a balanced liquid houseplant fertiliser at half strength to support its fast growth. Reduce to roughly monthly or stop in autumn and winter when growth slows. Feed every 2-4 weeks in spring and summer with a balanced liquid houseplant fertiliser at half strength to support its fast growth. Reduce to roughly monthly or stop in autumn and winter when growth slows. 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 pilea mollis?

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

What does over-feeding pilea mollis 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 mollis 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 mollis?

Flush the pot of pilea mollis 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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