Achillea millefolium

Yarrow Care & Identification Guide

A legendary and incredibly resilient wildflower steeped in ancient mythology, Yarrow (Achillea millefolium) features flat-topped clusters of tightly packed, tiny blossoms rising above delicate, fern-like foliage. Highly valued for its rugged drought resistance, it is a must-have for sunny borders, pollinator gardens, and dry meadows. It is widely celebrated by botanists for its distinct environmental adaptability and structural appeal.

Sunlight Full Sun

Watering Low

Soil Mix Poor

Temperature 15°C - 28°C

Toxicity Toxic to Pets

Botanical macro photography of Yarrow (Achillea millefolium) - Plant AI care database

How to Identify Yarrow

A highly aromatic, clump-forming herbaceous perennial producing large, flat-topped, umbrella-like clusters (corymbs) of tiny, tightly packed blossoms on stiff, erect stems.

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Key Visual Features: Highly distinct, feathery, fern-like green leaves that are deeply divided into hundreds of tiny, delicate segments, emitting a spicy, herbal scent when crushed.
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Color Variations: Classic wild white and pastel yellow, with modern cultivated varieties in vibrant shades of pink, crimson red, terracotta, and deep orange.
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Common Confusions: Can be confused with Queen Anne's Lace or wild Tansy, but Yarrow is easily identified by its deeply divided, feather-like, highly aromatic leaves and its flat-topped, dense clusters of tiny composite flowers (not open, lace-like umbels).

💡 Plant AI Tip: If you are not sure, take a photo with Plant AI to identify it instantly.

Complete Care & Cultivation Guide

Follow our detailed scientific care guide to keep your Yarrow thriving and gorgeous all year round.

Yarrow requires a highly measured water supply. Typically, water thoroughly until it drains out of the bottom holes only when the top soil layer becomes dry. Based on its specific characteristics: Low (Extremely drought-tolerant once established; water moderately during prolonged droughts; highly sensitive to wet clay or waterlogged soils). Never allow the roots to sit in stagnant water as it leads to root decay. Reduce watering significantly during autumn and winter dormant phases.

Regular deadheading is essential for Yarrow. Snip off faded, spent flowers immediately to prevent seed production and redirect the plant's energy into producing fresh new buds. Trim yellowing or damaged foliage near the stem base using sterilized bypass shears.

Feed Yarrow heavily in spring and summer with a fertilizer high in phosphorus to support prolific bud development and rich petal color. Apply a diluted balanced flower liquid fertilizer every 2 to 3 weeks. Avoid excess nitrogen which results in massive green leaves but sparse blooms.

Yarrow requires Full Sun (Requires 6+ hours of intense, direct sunlight daily; lower light results in weak, floppy stems and poor, dull flowering). Provide bright, consistent indirect filtered sunlight daily. Avoid exposing the foliage to harsh direct midday sun which can easily bleach, scorch, or dry out the delicate leaves.

The optimal substrate for Yarrow is a loose, rich, exceptionally fast-draining potting soil. Based on requirements: Poor to average, sandy or gravelly, exceptionally well-draining soil (highly fertile soil leads to rapid, leggy foliage growth and floppy stems) (pH 5.6-7.5). A standard high-aeration mix consists of 50% organic peat moss or coco coir, 30% chunky orchid bark or pumice, and 20% coarse perlite to facilitate excellent oxygen circulation.

Easily propagate Yarrow using stem cuttings in spring. Cut a healthy 4-inch stem section just below a node, remove lower leaves, and submerge the node in clean water or moist perlite mix until active roots develop in 3 weeks.

Thrives in standard warm environmental conditions: 15°C - 28°C (59°F - 82°F); highly cold-hardy perennial, thrives in zones 3-9. Keep the plant safe from cold drafts, drafty windows, air conditioning vents, or direct heaters. Ensure winter protection is maintained to prevent cellular damage and floppy leaf decay.

Choose a heavy unglazed clay or terracotta container with multiple bottom drainage holes. Terracotta allows excess soil moisture to breathe and evaporate safely. Repot the plant every 1 to 2 years in spring, upgrading to a container that is 2 inches wider.

Regularly inspect Yarrow leaves for spider mites spinning fine webs under dusty leaves, cottony mealybugs hiding in leaf joints, or scale insects on stems. Treat immediately by wiping foliage with organic neem oil solution or spraying with mild insecticidal soap every 7 days.

Yarrow can be affected by: • **Stem Rot (Fungal)**: Symptoms include Soft, brown or black rot at the base of the stems, causing the entire plant clump to wilt and collapse in hot, wet summer weather.. *Action*: Plant in highly draining soil, avoid overhead watering, and thin out dense clumps to maximize airflow. | • **Rust (Fungal)**: Symptoms include Orange-brown powdery pustules forming on the undersides of the fern-like leaves, causing them to turn yellow and dry up.. *Action*: Prune off and discard infected leaves immediately. Spray the plant thoroughly with copper-based organic fungicide.. Always prioritize soil drainage and proper air circulation. Spray leaves with organic fungicides like copper fungicide or chamomile tea sprays to prevent bacterial leaf spot spreads.

The secret to a gorgeous Yarrow is consistent placement and cleaning. Avoid rotating or moving the plant frequently as sudden environmental shifts can induce shock. Wipe leaves with a damp microfiber cloth monthly to clear dust and enhance natural photosynthesis.

Common Diseases & Treatment

Stem Rot (Fungal)

Symptoms: Soft, brown or black rot at the base of the stems, causing the entire plant clump to wilt and collapse in hot, wet summer weather.

Action: Plant in highly draining soil, avoid overhead watering, and thin out dense clumps to maximize airflow.

Rust (Fungal)

Symptoms: Orange-brown powdery pustules forming on the undersides of the fern-like leaves, causing them to turn yellow and dry up.

Action: Prune off and discard infected leaves immediately. Spray the plant thoroughly with copper-based organic fungicide.

Frequently Asked Questions

Why is my Yarrow falling over and splitting open in the middle of the clump?

This is usually caused by too much fertilizer, water, or shade! Yarrow is native to dry, lean, low-fertility grasslands. In overly rich soils or when pampered with regular watering and fertilizer, it grows too fast, creating weak, floppy, top-heavy stems that collapse.

Is Yarrow toxic to my household pets?

Yes! Yarrow is toxic to dogs and cats. It contains volatile oils, thujone, and sesquiterpene lactones. Ingestion of the leaves or flowers can lead to vomiting, diarrhea, depression, and increased urination. Contact with the plant's juices can also cause allergic skin reactions (contact dermatitis) in sensitive animals.

What is the historical meaning behind Yarrow's scientific name, Achillea?

It is named after the Greek hero Achilles! According to ancient mythology and Greek history, Achilles used Yarrow leaves to treat and stop the bleeding of his soldiers' wounds during the Trojan War. The plant has been used for centuries in traditional herbal medicine to staunch blood flow.

How do I care for Yarrow after it finishes blooming in mid-summer?

Cut the plant back! After the first major flush of flowers fades, shear the entire plant back by half or down to the basal foliage. This removes unsightly dead brown flower heads, prevents unwanted self-seeding, and stimulates a fresh, compact flush of lush green leaves and a second round of blooms in late autumn.