Yarrow Identification (Achillea millefolium)

Use these quick checks to assess Achillea millefolium by sight.

• Leaves are alternate and narrow in outline, about 2-6 inches (5-15 cm) long, but cut into many fine segments for a feathery look.
• Stems are upright, usually unbranched below, with several leafy sections along the stem.
• Flower heads sit in a flat-topped cluster at the stem tip, forming a broad, level surface.
• Each small flower head is about 1/8-1/4 inch (3-6 mm) wide and usually shows 4-6 short ray florets around the edge.

Check both the finely divided leaves and the flat flower cluster, since together they are especially useful.

Yarrow shows clear structural changes from early divided leaves to flat-topped flowering stems.

• Seedling: Seedlings form a small basal rosette with narrow first leaves, then quickly produce finely divided true leaves that already show the fernlike pattern.
• Young plant: Before flowering, the plant stays low and tufted, with many basal leaves and few upright stems; leaves lengthen to about 2-6 inches (5-15 cm).
• Mature plant: Mature plants send up several erect, leafy stems from the crown, creating a broader clump; upper leaves are smaller and more finely cut than basal leaves.
• Flowering stage: At flowering, stems branch near the top into flat-topped clusters of many small white to pinkish heads, a strong contrast with the earlier leafy rosette.

Yarrow has several named selections with consistent, easy-to-see differences.

• 'Cerise Queen': Flowers are deep cerise-pink rather than the typical white to pale pink, held in broad flat clusters.
• 'Paprika': Flower heads open brick red to salmon-red with paler centers, giving a warmer, darker look than the species.
• 'Moonshine': This form stands out for sulfur-yellow flower clusters and a tidier mound, usually about 18-24 inches (45-60 cm) tall.
• 'Red Velvet': Flower clusters are a saturated dark red and keep a deeper color than most pink-flowered forms.

In spring, Yarrow forms fresh basal clumps of finely divided, fernlike leaves. By early to midsummer, upright stems carry flat-topped clusters of small white to pale pink flower heads, which are among the clearest field marks. After flowering, the heads dry and turn tan. In winter, top growth often dies back, leaving a reduced or bare patch.

Several carrot-family plants can be mistaken for Yarrow at a quick glance.

Achillea millefolium is native across much of Europe, Asia, and North America. Its broad native range matters because wild plants are often found far beyond gardens, especially in temperate regions. Look for it in open, sunny places such as meadows, prairies, roadsides, field edges, and disturbed ground. Finding a plant in dry to moderately moist grassland or similar open habitat helps separate it from shade-loving look-alikes.

• Skin contact: Leaves and stems can cause contact dermatitis in some people, especially during handling. This is a skin-contact risk for humans rather than an ingestion risk.
• Ingestion: Achillea millefolium can be mildly toxic if eaten by pets, especially dogs, cats, and horses. The concern is ingestion of the plant parts, including leaves and flowers.
• Hazardous confusion: Yarrow is sometimes confused with poison hemlock, a highly poisonous plant. Poison hemlock has smooth, hollow stems with purple blotches, unlike yarrow’s finely divided fern-like leaves and clustered flower heads.