Water the Cape Star-Chestnut thoroughly when the top 2-3 cm of soil feels dry. Reduce watering significantly during winter dormancy. Ensure good drainage to prevent waterlogging, which can lead to root rot.

Overwatering is a common mistake; allow the soil to dry out slightly between waterings.

Prune to maintain shape and size, and to remove dead or damaged branches. Light pruning can be done anytime, but heavier pruning should be undertaken in late winter or early spring before new growth begins.

Sterculia alexandri responds well to shaping for aesthetic appeal or to manage space.

Propagate from seeds sown in spring, or by semi-hardwood cuttings taken in summer. Seeds require warm conditions and consistent moisture for germination.

Cuttings should be treated with rooting hormone and placed in a well-draining medium. Patience is key for successful propagation.

Repot young plants annually or every two years, and mature plants every 3-5 years, in spring. Use a well-draining potting mix. Choose a pot one size larger than the current one.

Repotting helps refresh the soil and provides space for root growth, essential for a healthy plant.