Yarrow

Yarrow is a supremely tough perennial wildflower that has been cultivated in gardens for centuries both as an ornamental and a medicinal herb. The flat-topped flower clusters (corymbs) sit atop sturdy 60-90cm stems above finely divided, feathery foliage that is aromatic when brushed. Modern cultivars offer colors ranging from the traditional white and golden yellow through salmon, orange, cherry red, and pastel pink.

Plant in full sun in any well-drained soil—yarrow actually performs best in poor, lean, dry conditions. Rich soil and shade produce floppy, weak growth and promote mildew. Sandy, gravelly, or even rocky soils produce the most compact, self-supporting plants. This makes yarrow ideal for gravel gardens, prairie plantings, green roofs, and anywhere water conservation is important.

Yarrow spreads by underground rhizomes and can become quite assertive in favorable conditions. Divide every 2-3 years in spring to control spread and maintain vigor. Deadhead spent flower heads promptly to encourage a second flush of bloom and prevent self-seeding. Cut all growth to the ground in late autumn or early spring.

Achillea millefolium, commonly known as yarrow, is one of the oldest and most widely used medicinal plants in human history. Archaeological evidence from Neanderthal burial sites at Shanidar Cave in Iraq, dating to approximately 60,000 years ago, suggests that yarrow may have been among the earliest plants used by hominids for medicinal purposes. Native to temperate regions of Europe, Asia, and North America, yarrow has been a cornerstone of traditional medicine on every inhabited continent for millennia. In ancient Greece, the physician Dioscorides recorded yarrow as a treatment for wounds and bleeding in his foundational text De Materia Medica around 70 CE, and the plant's association with the legendary hero Achilles cemented its reputation as the premier battlefield herb of the ancient world. Throughout medieval Europe, yarrow was cultivated in monastery herb gardens and prescribed by herbalists for fevers, digestive complaints, menstrual irregularities, and wound care. The Anglo-Saxon Nine Herbs Charm, dating to the 10th century, lists yarrow among nine sacred healing plants. Native American tribes including the Cherokee, Navajo, and Blackfoot independently developed extensive yarrow-based remedies for pain relief, fever reduction, and wound treatment. Chinese traditional medicine has employed yarrow for thousands of years, both as a medicinal herb and as the preferred plant for I Ching divination rituals. European colonists carried yarrow seeds to new settlements worldwide, and by the 18th century it had naturalized across most temperate regions. Modern phytochemical research has validated many traditional uses, identifying active compounds including sesquiterpene lactones, flavonoids, alkaloids, and volatile oils with demonstrated anti-inflammatory, antimicrobial, and hemostatic properties.

Yarrow thrives in poor to average, well-drained soil with a pH of 5.5-7.5. It actively prefers lean conditions—rich, fertile soil causes lanky growth and promotes disease. Sandy, gravelly, or loamy soils are ideal. Do not fertilize or amend soil with rich organic matter. If any feeding is needed, a single light application of balanced fertilizer in spring is more than sufficient. Yarrow is one of the best perennials for infertile, dry sites.

Yarrow is an excellent cut flower, lasting 7-10 days in a vase. Cut when the flat heads are fully colored with most florets open. The flowers also dry superbly—cut at peak color and hang upside down for 2-3 weeks. Dried yarrow retains excellent color, especially the yellow and pastel varieties. For medicinal use, harvest leaves and flowers during peak bloom and dry for herbal preparations.

Yarrow is one of the finest flowers for drying. Cut stems when fully open, strip lower leaves, bundle loosely, and hang upside down in a dark, warm room for 2-3 weeks. The flat heads maintain their shape perfectly and retain color for 6-12 months. Yellow varieties hold their color longest; reds and pinks may fade to softer tones. Yarrow is a staple of dried wreaths, arrangements, and potpourri. Seeds can be collected when heads turn brown.