Achillea millefolium 1g

Achillea millefolium (Common Yarrow, White Yarrow) is a California native perennial valued for its finely divided, fern-like foliage, flat-topped clusters of white flowers, and adaptability to a wide range of landscape conditions. Its low, spreading foliage typically grows 4–8 inches tall, while upright flower stalks generally reach 1–2 feet and may grow taller under favorable conditions. Blooming primarily from spring through summer, the flowers attract bees, butterflies, and other beneficial insects and can also be used in fresh or dried arrangements. Once established, Common Yarrow is drought tolerant and well suited to native gardens, pollinator plantings, meadows, perennial borders, slopes, and low-water landscapes. Its aromatic foliage is generally resistant to deer browsing.

Quick Facts:

Botanical Name: Achillea millefolium

Common Name: Common Yarrow, White Yarrow

Plant Type: California native herbaceous perennial

Mature Size: Foliage approximately 4–8 inches tall, with flower stalks generally reaching 1–2 feet; plants may spread 1–2 feet or more

Exposure: Full sun to light shade

Water: Low once established; occasional supplemental irrigation may extend flowering and help maintain greener foliage

Soil: Adaptable to a variety of soils; performs best with adequate drainage

Bloom Season: Primarily spring through summer

Flower Color: White

Foliage Color: Green

Seasonality: Evergreen to semi-evergreen in mild climates; may become dormant or lose foliage during drought, extreme heat, or winter cold

Growth Rate: Moderate to fast

Growth Habit: Low, spreading foliage with upright flower stalks; spreads by rhizomes

Wildlife Value: Flowers attract bees, butterflies, and other beneficial insects

Deer Resistance: Generally resistant due to its aromatic foliage

California Native: Yes

Landscape Uses: California native gardens, pollinator and habitat gardens, naturalized meadows, cottage gardens, perennial borders, slopes, parkways, mass plantings, informal lawn alternatives, and low-water landscapes

Habit & Size: Common Yarrow forms a low, spreading mat of finely divided, aromatic green foliage. The foliage generally remains 4–8 inches tall, while upright flowering stems carry broad, flat-topped clusters of small white flowers 1–2 feet above the ground. Plants spread by rhizomes and may gradually form colonies, particularly where they receive regular moisture. Their ultimate size and rate of spread depend on climate, irrigation, soil, and maintenance.

Cultural Requirements: Achillea millefolium performs best in full sun but tolerates light shade, particularly in warmer inland locations. It adapts to a wide range of soil types as long as drainage is adequate and becomes drought tolerant once established. Occasional supplemental irrigation can extend flowering and help plants retain a greener appearance, but excessive water or overly rich soil may produce weak, floppy growth. Removing spent flower stalks can encourage additional bloom, while cutting plants back after flowering can promote fresh foliage. Older or overcrowded clumps may be divided as needed to control their spread and maintain vigor.

Landscape Uses: Common Yarrow is well suited to California native gardens, pollinator and habitat plantings, naturalized meadows, cottage gardens, perennial borders, slopes, parkways, and mass plantings. Its spreading foliage can provide informal ground coverage, while its upright white flowers add seasonal color and contrast. Its drought tolerance, adaptability, and ability to attract beneficial insects make it useful in low-water, naturalistic, and habitat-oriented landscapes.

For landscape designers, Common Yarrow can provide a low layer beneath taller perennials, shrubs, and ornamental grasses. Its fine-textured foliage contrasts effectively with plants that have broader leaves or stronger architectural forms, while its white flowers can visually connect mixed plantings without competing with more colorful flowering species. Because it spreads by rhizomes, its placement and available growing area should be considered where a highly contained or uniform planting is required.

Common Yarrow can also be used in selected commercial landscapes, including naturalistic borders, pollinator plantings, parkways, slopes, and other low-water installations. Its informal spreading habit is better suited to designs that allow plants to naturalize than to tightly controlled formal beds.

Identification Note: Achillea millefolium is recognized by its finely divided, fern-like green foliage and flat-topped clusters of small white flowers held on upright stems. Unlike colorful ornamental yarrow cultivars and hybrids, the species typically produces white flowers and has a more naturalistic appearance.

Pests and Cultural Considerations: Common Yarrow is generally easy to grow and experiences few serious pest or disease problems. Good drainage and air circulation can help reduce foliar diseases. Excessive irrigation or overly fertile soil may cause flowering stems to become tall and floppy. Because plants spread by rhizomes, occasional thinning or division may be needed where a more contained planting is desired. Its aromatic foliage is generally resistant to deer browsing, although no plant is completely deer-proof.

Frequently Asked Questions:

Can Common Yarrow be used as a lawn alternative? Common Yarrow can be used in informal, low-water lawn alternatives and meadow-like plantings. It tolerates occasional mowing, which keeps the foliage lower and limits flowering. It does not create the uniformly manicured appearance of conventional turfgrass.

Does Common Yarrow tolerate foot traffic? Established plants can tolerate occasional light foot traffic, but Common Yarrow is not ideal for frequently used pathways, play areas, or other locations exposed to constant compaction. Stepping stones can be incorporated where regular access is needed.

What plants pair well with Common Yarrow in a California landscape? Common Yarrow combines well with other sun-loving, low-water plants such as California buckwheats (Eriogonum), sages (Salvia), penstemons, California fuchsia (Epilobium canum), deer grass (Muhlenbergia rigens), and California sagebrush (Artemisia californica). These combinations can provide contrasting forms, staggered bloom periods, and additional habitat value.