Water Dianthus armeria regularly, especially during dry spells, but allow the soil to dry slightly between waterings. Avoid overwatering, which can lead to root rot.

Aim for consistently moist, but not waterlogged, soil for optimal growth and flowering.

Deadhead spent flowers regularly to encourage continuous blooming and maintain a tidy appearance. In late autumn or early spring, trim back any dead or overgrown foliage to promote healthy new growth.

Light trimming can also help maintain a compact shape.

Dianthus armeria can be propagated from seed sown in early spring, either directly outdoors or in a greenhouse. It also readily self-seeds.

Cuttings can be taken from non-flowering shoots in late spring or early summer and rooted in a well-draining medium.

Repotting is generally not necessary for Dianthus armeria, as it is often grown as an annual or short-lived perennial. If grown in containers, repot every 1-2 years in spring if the plant becomes root-bound, using a well-draining potting mix.