Sonoma Coast Yarrow

Achillea millefolium 'Sonoma Coast' is a low, spreading selection with bright green, finely divided leaves and flat-topped white flower clusters. Selected by Sherrie for [California Flora Nursery](https://www.calfloranursery.com/) from Highway One near Salmon Creek, it brings coastal provenance to borders, rock gardens and habitat plantings; the nursery's [cultivar record](https://www.calfloranursery.com/app/uploads/2026/04/CalFlora_Cultivars_Introductions-3.pdf) documents that origin. ## Garden use and seasons Flowers can continue from spring into fall, depending on local conditions, and attract bees, butterflies and other beneficial insects ([California Flora Nursery](https://www.calfloranursery.com/plants/achillea-millefolium-sonoma-coast/); [Annie's Annuals](https://www.anniesannuals.com/products/achillea-millefolium-sonoma-coast)). Its compact, mat-forming habit suits groundcover, meadow-style plantings, erosion control and lawn alternatives; flower stems can also be cut for arrangements ([Boething Treeland Farms](https://www.boethingtreeland.com/plants/achillea-millefolium-sonoma-coast/); [El Nativo Growers](https://elnativogrowers.com/achillea-millefolium-sonoma-coast-1g/)). Exact-cultivar sources report height from about 6 to 24 inches and spread from 12 to 36 inches ([California Flora Nursery](https://www.calfloranursery.com/plants/achillea-millefolium-sonoma-coast/); [Urban Tree Farm](https://www.urbantreefarm.com/product/achillea-millefolium-sonoma-coast/); [Boething Treeland Farms](https://www.boethingtreeland.com/plants/achillea-millefolium-sonoma-coast/)). Allow room for the spreading clump, and follow spacing guidance from the grower supplying your plants. ## Growing conditions Plant in full sun; light or partial shade is also listed for this selection. It grows in well-drained soil and tolerates clay, sand and other poor soils when drainage is adequate ([Boething Treeland Farms](https://www.boethingtreeland.com/plants/achillea-millefolium-sonoma-coast/)). Nursery listings range from low to moderate water needs; once established, it tolerates dry periods, although some summer water can support a fresher display ([Annie's Annuals](https://www.anniesannuals.com/products/achillea-millefolium-sonoma-coast); [California Flora Nursery](https://www.calfloranursery.com/plants/achillea-millefolium-sonoma-coast/)). Reported hardiness ranges vary: USDA zones 3–10 at Boething Treeland Farms, 5–10 at Annie's Annuals, and 4–9 at Garden Center Marketing. ## Maintenance Remove faded flower heads to encourage continued bloom, or cut plants back to refresh growth ([Annie's Annuals](https://www.anniesannuals.com/products/achillea-millefolium-sonoma-coast)). Divide a clump every few years if its center weakens or it becomes crowded ([El Nativo Growers](https://elnativogrowers.com/achillea-millefolium-sonoma-coast-1g/)).