Water regularly to keep the soil consistently moist, especially during dry periods. Allow the top inch of soil to dry out slightly between waterings. Avoid overwatering, as this can lead to root rot.

Reduce watering frequency in cooler months.

Deadheading spent flowers regularly encourages more blooms and prevents self-seeding if unwanted. Light pruning can be done to maintain a tidy appearance or shape.

Remove any yellowing or diseased foliage promptly to promote plant health.

Valley Mayweed readily self-seeds. Seeds can be collected from mature flower heads and sown directly in the garden in autumn or early spring. It can also be propagated by division of established clumps in early spring.

As an annual or short-lived perennial that often self-seeds, repotting is rarely necessary. If grown in containers and it becomes root-bound, repot into a slightly larger container in spring using well-draining potting mix.