Water young common hackberry trees regularly, especially during dry periods, to establish a deep root system. Once mature, they are quite drought-tolerant. Water thoroughly when the top 5-10 cm of soil feels dry.

Avoid waterlogged conditions, as this can lead to root rot.

Prune young trees to establish a strong, central leader and well-spaced scaffold branches. Remove dead, damaged, or crossing limbs at any time.

For mature trees, pruning is typically minimal, focused on maintaining shape and removing any problematic branches. Best done during dormancy.

Propagation is typically done by seed. Seeds require a period of cold stratification to overcome dormancy. Stratify seeds by sowing them in a moist medium and refrigerating for 2-4 months.

Alternatively, cuttings can be taken from semi-hardwood in summer, though rooting success can be variable.

Repotting is generally not required for Celtis occidentalis, as it is a large tree typically grown in situ.

If container-grown specimens become root-bound, repot in spring into a larger container using well-draining potting mix. Avoid disturbing the root ball excessively.