Fertilising guide
How to fertilise Fern-leaf Yarrow 'Gold Plate' (Achillea filipendulina)— schedule & NPK
Also called Fern-leaf Yarrow, Gold Plate Yarrow, Tall Yellow Yarrow.
More about fern-leaf yarrow 'gold plate'
About Fern-leaf Yarrow 'Gold Plate'
Achillea filipendulina · also called Fern-leaf Yarrow, Gold Plate Yarrow · flowering
Achillea filipendulina 'Gold Plate' is a tall, stately yarrow producing large, flat-topped golden-yellow flower heads up to 15 cm across on rigid stems from midsummer into early autumn. The aromatic, finely divided fern-like foliage is attractive even when not in flower. Drought-tolerant and excellent for cutting and drying. Yarrow is toxic to cats and dogs according to the ASPCA.
Growth habit: Upright, strongly rhizomatous herbaceous perennial
What fertiliser fern-leaf yarrow 'gold plate' actually wants — and why
Fern-leaf Yarrow 'Gold Plate' 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 fern-leaf yarrow 'gold plate': 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 fern-leaf yarrow 'gold plate', 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 fern-leaf yarrow 'gold plate':
Requires minimal feeding. Excessive fertility produces lush, floppy growth and reduces the aromatic compounds in the foliage. A light balanced feed in spring in genuinely poor soils is sufficient; established plants in average soils need no supplementary fertiliser. 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 fern-leaf yarrow 'gold plate' 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 fern-leaf yarrow 'gold plate'
Half strength is the safe default for fern-leaf yarrow 'gold plate' — 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 fern-leaf yarrow 'gold plate' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the fern-leaf yarrow 'gold plate' watering schedule.
Signs you are over-feeding fern-leaf yarrow 'gold plate'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for fern-leaf yarrow 'gold plate':
- 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 fern-leaf yarrow 'gold plate'
- 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 fern-leaf yarrow 'gold plate' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of fern-leaf yarrow 'gold plate' 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 fern-leaf yarrow 'gold plate'
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 fern-leaf yarrow 'gold plate' — frequently asked questions
What fertiliser does fern-leaf yarrow 'gold plate' 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. Fern-leaf Yarrow 'Gold Plate' 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 fern-leaf yarrow 'gold plate'?
Requires minimal feeding. Excessive fertility produces lush, floppy growth and reduces the aromatic compounds in the foliage. A light balanced feed in spring in genuinely poor soils is sufficient; established plants in average soils need no supplementary fertiliser. Requires minimal feeding. Excessive fertility produces lush, floppy growth and reduces the aromatic compounds in the foliage. A light balanced feed in spring in genuinely poor soils is sufficient; established plants in average soils need no supplementary fertiliser. 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 fern-leaf yarrow 'gold plate'?
Half strength is the safe default for fern-leaf yarrow 'gold plate' — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding fern-leaf yarrow 'gold plate' 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 fern-leaf yarrow 'gold plate' 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 fern-leaf yarrow 'gold plate'?
Flush the pot of fern-leaf yarrow 'gold plate' 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
- Fern-leaf Yarrow 'Gold Plate' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water fern-leaf yarrow 'gold plate' — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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