Green ash prefers consistent moisture, especially when young. Water deeply once a week during dry spells, allowing the soil to dry slightly between waterings.

Mature trees are more drought-tolerant but benefit from occasional watering in extended periods of dryness to maintain optimal health and vigor.

Prune green ash in late winter or early spring while the tree is dormant to remove dead, damaged, or crossing branches. This promotes good structure and air circulation.

Avoid heavy pruning during the growing season, as it can stress the tree and attract pests and diseases.

Green ash can be propagated from seeds, which require a period of cold stratification. It can also be propagated vegetatively through softwood or semi-hardwood cuttings taken in late spring or summer.

Successful rooting often requires a rooting hormone and a humid environment.

Repotting is generally not applicable to mature green ash trees as they are typically planted directly in the ground. For nursery-grown saplings, repotting should be done in early spring or late fall, choosing a container slightly larger than the current one with well-draining potting mix.