Fernleaf Yarrow

Fernleaf yarrow (*Achillea filipendulina*) is a tall, clump-forming perennial with fern-like aromatic foliage and broad, flat clusters of golden-yellow flowers. [NC State Extension](https://plants.ces.ncsu.edu/plants/achillea-filipendulina/common-name/fernleaf-yarrow/) lists mature plants at 3–4 feet tall and 2–3 feet wide; the [RHS species profile](https://www.rhs.org.uk/plants/90798/achillea-filipendulina/details) describes a larger possible height, so allow room for a tall border clump and expect dimensions to vary with climate and growing conditions. ## Garden use and seasonal interest Use it toward the back or middle of a sunny border, in gravel or wildlife gardens, or in repeated groups. Its long-stemmed flowers suit fresh or dried arrangements, and the finely divided leaves add a soft, fern-like texture. The NC State profile reports flowering through much of summer when spent flowers are removed; the RHS species profile extends the season into early autumn. This species is native to central and southwestern Asia and has naturalized in parts of Europe and North America, so check local guidance near natural areas. ## Siting Plant in full sun and average, well-drained soil. It tolerates dry soil, but poorly drained winter soil can cause trouble. Avoid excessive fertilizer, which can encourage loose growth. ## Maintenance Water new plants while roots establish, then let the soil dry between waterings. Deadhead to encourage additional flowers, cut untidy stems back in spring, and divide clumps as needed to limit overcrowding. Watch for aphids, powdery mildew, rust, and stem rot.