Colorado Yarrow

Achillea millefolium 'Colorado' is a clump-forming yarrow with finely divided, aromatic gray-green foliage and flat summer flower clusters in shades of pink, red, orange, yellow, or white. The [Royal Horticultural Society (RHS)](https://www.rhs.org.uk/plants/76090/achillea-millefolium-colorado/details) profiles it as the Colorado Group and lists those colors for this exact plant name. ## Garden use and flower display Grow it in full sun as a border plant or for cutting. The RHS also lists cottage and informal gardens, gravel gardens, prairie plantings, wildlife gardens, and city or courtyard gardens as suitable settings. Its profile gives ultimate height and spread ranges of 0.5–1 m. In the 1997 annual cultivar trial recorded by [NC State Extension](https://cutflowers.ces.ncsu.edu/achillea-millefolium-colorado/), plants averaged 5.4 stems per plant with 15-inch stems, giving a measured reference for cut-flower use under that trial's conditions. ## Siting and soil Choose moist but well-drained soil; the RHS lists chalk, loam, and sand. The RHS identifies the foliage as aromatic and describes the habit as clump-forming. Its general [Achillea growing guide](https://www.rhs.org.uk/plants/achillea/how-to-grow-achillea) notes that yarrows tolerate dry spells after establishment and benefit from deadheading and periodic division. ## Maintenance Water new plants while they establish. Remove faded flower stems to keep the planting tidy, and divide clumps every few years if they become congested. Cut back untidy foliage in spring.