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Plant care

Fern-leaf Yarrow 'Gold Plate' (Fern-leaf Yarrow) care

Achillea filipendulina

Also called Fern-leaf Yarrow, Gold Plate Yarrow, Tall Yellow Yarrow.

RHS H7USDA 3-9Toxic to petsIndoor 90-130 cm tall

Watering rhythm

7-14days

When the top 3-5 cm of soil is dry, roughly every 7-14 days; very infrequent once established

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Light

Direct sun (at least 4-6 hours)

Soil

Well-draining, average to poor fertility loam or sandy soil

Humidity

35-55%

Temp

-30-35°C

Pet safety

Toxic to pets

Mature size

90-130 cm tall

Care at a glance

Light

Fern-leaf Yarrow 'Gold Plate' needs sun on the leaves, not just bright ambient room light. Requires full sun — 6-8 hours of direct sunlight per day minimum. Insufficient light causes tall cultivars to flop dramatically and reduces flowering. Ideal for open, sunny herbaceous borders, prairie and meadow plantings, and cottage gardens. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water fern-leaf yarrow 'gold plate' when the top 3-5 cm of soil is dry, roughly every 7-14 days; very infrequent once established. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Highly drought-tolerant once established. Overwatering and waterlogged soils are the main causes of decline. Water deeply but infrequently. Average rainfall in temperate climates is usually sufficient once plants are established. Reduce significantly in autumn.

Soil and pot

Fern-leaf Yarrow 'Gold Plate' grows best in well-draining, average to poor fertility loam or sandy soil. Yarrow thrives in lean, well-drained soils and deteriorates rapidly in rich, poorly drained conditions. Avoid heavy clay or constantly moist soil which causes crown rot and flopping. A neutral pH of 6.5–7.5 is ideal. Add grit to improve drainage in clay soils. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Fern-leaf Yarrow 'Gold Plate' sits happiest at around 35-55% humidity and -30-35°C (-22-95°F). Well-adapted to moderate and low humidity. Excessive humidity combined with poor drainage promotes fungal powdery mildew on foliage. Good air circulation around the plant reduces disease incidence. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed fern-leaf yarrow 'gold plate' sparingly. 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. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on fern-leaf yarrow 'gold plate' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Flopping / stem lodging — Tall cultivars may need staking in rich soils or in exposed sites; use grow-through supports inserted in spring.
  • Powdery mildew — Common on lower foliage in dry summers; improve air circulation by thinning clumps and removing affected leaves.
  • Invasive spreading — Strong rhizomes spread rapidly; divide every 2-3 years in spring to contain the clump and maintain vigour.
  • Root rot — Prolonged wet conditions cause crown and root rot; ensure excellent drainage and avoid waterlogged spots.
  • Aphids — Colonies occasionally cluster on new growth and flower stems; spray with a strong jet of water or apply insecticidal soap.

Companion plants

Fern-leaf Yarrow 'Gold Plate' pairs well with Echinops ritro, Echinacea purpurea, Salvia nemorosa, and Veronicastrum virginicum. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Divide spreading clumps every 2-3 years in spring or autumn, replanting vigorous outer sections and discarding the exhausted centre. The species can also be propagated from basal stem cuttings in spring, or from seed (cultivars may not come fully true). Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Fern-leaf Yarrow 'Gold Plate' is toxic to pets. Achillea (yarrow) is listed by the ASPCA as toxic to dogs, cats, and horses. It contains sesquiterpene lactones, alkaloids, and glycoalkaloids that can cause vomiting, diarrhoea, increased urination, and photosensitivity reactions. Keep away from pets and livestock. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Fern-leaf Yarrow 'Gold Plate' care — frequently asked questions

What is the common name for Achillea filipendulina?

Achillea filipendulina is most commonly called Fern-leaf Yarrow 'Gold Plate', but it is also known as Fern-leaf Yarrow, Gold Plate Yarrow, Tall Yellow Yarrow. The names refer to the same species, so care instructions for Fern-leaf Yarrow 'Gold Plate' apply identically to anything sold as Fern-leaf Yarrow.

How much light does fern-leaf yarrow 'gold plate' need?

Fern-leaf Yarrow 'Gold Plate' grows best in direct sun (at least 4-6 hours). Requires full sun — 6-8 hours of direct sunlight per day minimum. Insufficient light causes tall cultivars to flop dramatically and reduces flowering. Ideal for open, sunny herbaceous borders, prairie and meadow plantings, and cottage gardens.

How often should I water fern-leaf yarrow 'gold plate'?

Water fern-leaf yarrow 'gold plate' when the top 3-5 cm of soil is dry, roughly every 7-14 days; very infrequent once established. Highly drought-tolerant once established. Overwatering and waterlogged soils are the main causes of decline. Water deeply but infrequently. Average rainfall in temperate climates is usually sufficient once plants are established. Reduce significantly in autumn. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is fern-leaf yarrow 'gold plate' toxic to cats and dogs?

Fern-leaf Yarrow 'Gold Plate' is toxic to pets. Achillea (yarrow) is listed by the ASPCA as toxic to dogs, cats, and horses. It contains sesquiterpene lactones, alkaloids, and glycoalkaloids that can cause vomiting, diarrhoea, increased urination, and photosensitivity reactions. Keep away from pets and livestock.

What USDA hardiness zone does fern-leaf yarrow 'gold plate' grow in?

Fern-leaf Yarrow 'Gold Plate' is rated for USDA zone 3-9 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Fern-leaf Yarrow 'Gold Plate' deep-dive guides

Every aspect of fern-leaf yarrow 'gold plate' care, each with its own calibrated guide:

Featured in these plant shortlists

Fern-leaf Yarrow 'Gold Plate' qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Fern-leaf Yarrow 'Gold Plate' is also known as Fern-leaf Yarrow, Gold Plate Yarrow, and Tall Yellow Yarrow.