Water regularly, especially during establishment and dry periods. Allow the soil to dry slightly between waterings.

Coastal Kowhai is moderately drought-tolerant once established but performs best with consistent moisture. Avoid waterlogged conditions, as this can lead to root rot.

Prune after flowering to maintain shape and encourage bushier growth. Remove any dead, damaged, or crossing branches. Light pruning can be done to control size, but avoid heavy pruning, as it may reduce future flowering.

Sophora chathamica can be propagated from seeds or cuttings. Seeds require scarification and warm temperatures for germination. Cuttings are best taken in summer from semi-hardwood and rooted in a well-draining medium.

Repot young plants every 1-2 years in spring as needed to accommodate root growth. Use a well-draining potting mix.

Established plants generally do not require frequent repotting and can be left in their pots for longer periods.