Water regularly during establishment and dry periods, allowing the soil to dry out slightly between waterings. Once established, Cassinia arcuata is quite drought tolerant.

Overwatering can lead to root rot, so ensure good drainage.

Prune to maintain shape and size, and to encourage denser growth. Light pruning can be done after flowering to remove spent blooms and shape the plant.

Harder pruning can be done in late winter or early spring before new growth begins.

Cassinia arcuata can be propagated from seed sown in spring or from semi-hardwood cuttings taken in summer. Seeds may require a period of cold stratification. Cuttings should be rooted in a well-draining medium.

Repot young plants as needed, typically every 1-2 years, when they become root-bound. Mature plants in the ground rarely need repotting. Ensure the new pot has adequate drainage holes for optimal root health.