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Fertilising guide

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

Also called Lady's mantle, Soft lady's mantle.

More about alchemilla mollis

About Alchemilla mollis

Alchemilla mollis · also called Lady's mantle, Soft lady's mantle · flowering

Lady's mantle is a robust, mound-forming perennial grown for its softly hairy, pleated grey-green leaves that catch dew in silvery beads, and for froths of tiny chartreuse-yellow flowers in early to midsummer. Reaching around 0.45-0.6 m, it makes superb ground cover and edging in sun or shade and is a florist's favourite filler.

Growth habit: Low, dense, clump-forming herbaceous perennial spreading into a broad mound of rounded leaves topped with loose sprays of flowers.

What fertiliser alchemilla mollis actually wants — and why

Alchemilla 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 alchemilla 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 alchemilla 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 alchemilla mollis:

Rarely needs feeding in reasonable soil; a spring mulch of compost is usually sufficient. A light balanced feed in spring on poor soils encourages lush foliage. Treat that as sparingly through the growing season 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 alchemilla 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 alchemilla mollis

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

Signs you are over-feeding alchemilla mollis

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

Signs you are under-feeding alchemilla mollis

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

Flushing and leaching the salts

Flush the pot of alchemilla 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 alchemilla 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 alchemilla mollis — frequently asked questions

What fertiliser does alchemilla 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. Alchemilla 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 alchemilla mollis?

Rarely needs feeding in reasonable soil; a spring mulch of compost is usually sufficient. A light balanced feed in spring on poor soils encourages lush foliage. Rarely needs feeding in reasonable soil; a spring mulch of compost is usually sufficient. A light balanced feed in spring on poor soils encourages lush foliage. Treat that as sparingly through the growing season 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 alchemilla mollis?

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

What does over-feeding alchemilla 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 alchemilla 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 alchemilla mollis?

Flush the pot of alchemilla 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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