Achillea millefolium (Common Yarrow) is a classic, easy perennial valued for its finely divided, aromatic foliage and its broad, flat clusters of tiny white flowers that can bloom for a long stretch of summer. You can use it in naturalized areas, meadow-style plantings, pollinator beds, and sunny borders where you want a reliable plant that handles lean conditions.
Give it full sun for the sturdiest growth and best flowering, though it will also tolerate part shade. Once established, it is notably drought tolerant and performs well in well-drained soils, including poorer sites where many perennials struggle. In richer or consistently moist soil, stems can be more likely to flop, so a lighter hand with watering and fertilizer usually improves performance.
Mature size is typically about 24-36 inches tall, with a spreading habit from rhizomes. Because it can expand and self-seed, you will get the best garden results by dividing clumps every few years and thinning where needed. Deadheading after the first flush helps keep the planting tidy and can encourage additional bloom.
Common Yarrow is often avoided by deer and rabbits, and the flowers are attractive to butterflies and other beneficial insects. Cut stems fresh for bouquets or dry them for lasting arrangements, and consider grouping plants so the airy texture and flower plates read well from a distance.