Water regularly when the top 5 cm of soil feels dry. Ensure good drainage to prevent waterlogging, as Bupleurum fruticosum is drought-tolerant once established.

Reduce watering significantly during winter months to mimic its natural Mediterranean habitat.

Prune in early spring to shape the plant and remove any dead or damaged wood. Light pruning after flowering can encourage a bushier habit and potentially a second flush of blooms. Avoid heavy pruning into old wood.

Propagate from semi-hardwood cuttings taken in summer. Alternatively, sow seeds in autumn or early spring. Seeds may require stratification. Cuttings are generally more reliable for maintaining desired characteristics.

Repot young plants every 1-2 years in spring to provide fresh soil and accommodate root growth. Mature plants are best left undisturbed as they dislike root disturbance and can be prone to transplant shock.