Water yarrow regularly during its first year to establish a strong root system. Once established, it's drought-tolerant and prefers well-drained soil.

Water deeply but infrequently, allowing the soil to dry out slightly between waterings. Overwatering can lead to root rot, especially in heavy soils.

Deadheading spent flower clusters throughout the blooming season will encourage more flowers and prevent self-seeding.

Cut back the entire plant to the ground in late fall or early spring to tidy its appearance and promote vigorous new growth. This also helps prevent overcrowding.

Yarrow is easily propagated by division in early spring or fall. Clumps can be divided every 3-4 years to maintain vigor. It also readily self-seeds in suitable conditions.

Seeds can be sown indoors in early spring or directly outdoors after the last frost.

As a perennial that spreads by rhizomes, yarrow does not typically require repotting in containers.

If grown in pots, it may benefit from division every few years to prevent it from becoming root-bound and to rejuvenate the plant. This is best done in spring.