Plant Profile: Achillea tomentosa

Woolly Yarrow is a low-growing plant commonly utilized as ground cover. This semi-evergreen perennial thrives in dry, sandy soils and can also adapt to poorer soil conditions, provided there is adequate drainage. However, it is best to avoid soils that are overly moist, primarily clay-based, or rich in organic matter. Ideally, it should be planted in a location shielded from strong winds.

The plant produces vibrant yellow flowers that bloom in dense clusters from spring through summer. To encourage further blooming, it is advisable to deadhead the spent flowers. Additionally, cutting the plant back to its basal leaves after flowering can promote a second bloom in the fall and help maintain a tidy appearance in the garden. Every few years, or when the plant becomes overcrowded, it should be divided in early spring or fall.

Woolly Yarrow is resistant to deer, rabbits, and drought, and it can tolerate light foot traffic. It is suitable for rock gardens, container planting, or as an edging plant in garden spaces. However, it does not fare well in hot and humid conditions, which can lead to its decline; therefore, it is not recommended for areas in the southern USA south of zone 7.

The genus name Achillea is derived from the Greek hero Achilles, while tomentosa refers to the plant's woolly hairs.

In terms of pests and diseases, Woolly Yarrow is vulnerable to issues such as stem rot, powdery mildew, and rust.