Achillea millefolium

Yarrow :

Phonetic Spelling

ah-KIL-ee-uh mil-eh-FOH-lee-um


Common Names

  • Yarrow
  • Common Yarrow
  • Milfoil
  • Soldier’s Woundwort
  • Nosebleed Plant

Appearance

  • Size: Typically grows 1 to 3 feet tall, with slender, erect stems.
  • Leaves: Finely divided, feathery, fern-like leaves with a soft texture, arranged alternately along the stems. They are very aromatic when crushed!
  • Flowers: Small, flat-topped clusters of tiny, daisy-like flowers, usually white but occasionally pink, yellow, or red depending on the variety. Each flower measures about 1/4 inch in diameter.
  • Roots: Rhizomatous (horizontal roots) root system, enabling it to spread easily.

Habitats

  • Found across the Northern Hemisphere in meadows, grasslands, roadsides, and disturbed areas.
  • Prefers well-drained soils but tolerates a range of conditions, including sandy or rocky substrates.
  • Common in temperate regions, thriving in full sun to partial shade.
  • That’s why there are so many here in California! The population have been waning in recent years however…

Environmental Impacts

  • Soil Stabilization: The deep, fibrous root system prevents soil erosion, particularly in disturbed areas (often due to agricultural developments and grazing).
  • Pollinator Support: Attracts bees, butterflies, and other beneficial insects, making it valuable for ecosystems and pollinator gardens.
  • Invasiveness: Can become weedy or invasive in some regions due to its ability to spread through rhizomes and self-seeding.

Growth Factors

  • Sunlight: Prefers full sun but tolerates partial shade.
  • Soil: Thrives in poor to moderately fertile soils; drought-tolerant once established.
  • Water: Requires little water; overly moist soils can cause root rot. We made this mistake when we first planted these in our garden.

Fun Facts

  • Yarrows have been used for centuries in herbal medicine to treat wounds, fevers, and digestive issues. It’s sometimes called “Soldier’s Woundwort” for its use in battlefield first aid.
  • Yarrow is a pioneer species, often colonizing disturbed or degraded land, contributing to ecological recovery. That’s why they are so, so important to our ecosystem.
    • after forest fires in our area, Yarrows helped with reabundance!

Comments

2 responses to “Achillea millefolium”

  1. Any idea how I can use yarrow to stop soil erosion in my garden? It’s gorgeous but I want to plant something useful.

    1. Hannah Ko Avatar

      You’re absolutely correct about the yarrows and soil erosion! They have extremely dense root systems which helps with this and is especially great if you live in CA because Yarrows love drought conditions.

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