Water American Holly regularly, especially during the first year after planting and during dry spells. Ensure the soil remains consistently moist but not waterlogged.

Allow the top 2-3 cm of soil to dry out slightly between waterings to prevent root rot. Deep watering is preferable to frequent shallow applications.

Prune American Holly in late winter or early spring before new growth starts. Remove dead, damaged, or crossing branches. For shaping, prune lightly to maintain desired form.

Avoid heavy pruning, as it can stimulate excessive weak growth and reduce fruit production on female plants.

Propagate American Holly from semi-hardwood cuttings taken in summer or hardwood cuttings taken in late fall. Use a rooting hormone and plant in a well-draining medium in a humid environment.

Seed propagation is possible but can be slow and may not produce true-to-type plants.

Repot young American Holly plants every 2-3 years to refresh the soil and provide more space for root growth. Use a well-draining potting mix. Choose a pot that is slightly larger than the current one.

Repotting is best done in early spring before the growing season begins.