Water deeply but infrequently once established. Allow the soil to dry out completely between waterings. Overwatering is the most common cause of failure for Fremontodendron californicum, leading to root rot.

Reduce watering significantly in cooler months to mimic its native dry summer conditions.

Prune after flowering to shape the plant and remove any dead or crossing branches. Avoid heavy pruning as it may not recover well. Lightly trim to maintain size and encourage bushier growth.

Pruning in late winter or early spring before new growth begins is also an option.

Propagation is typically done from semi-hardwood cuttings taken in summer. Use a rooting hormone and plant in a well-draining medium.

Alternatively, seed propagation is possible but may take longer, and germination can be erratic. Stratification may improve germination rates.

Repotting is generally not recommended for mature Fremontodendron californicum due to their sensitivity to root disturbance.

If container growing, choose a large pot from the start and repot only when absolutely necessary, carefully disturbing the root ball as little as possible. Use a very gritty, well-draining soil mix.