Nyssa sylvatica prefers consistent moisture, especially when young. Water deeply and regularly during dry periods. Avoid waterlogged soil, as this can lead to root rot.

Mature trees are more drought-tolerant but benefit from occasional watering during prolonged dry spells to maintain optimal health and fall color.

Prune Nyssa sylvatica to shape the tree and remove dead, damaged, or crossing branches. The best time for structural pruning is during late winter when the tree is dormant.

Avoid heavy pruning, as the tree has a naturally attractive form. Maintain good air circulation within the canopy.

Blackgum can be propagated from seeds, which require a period of stratification to break dormancy. Softwood or semi-hardwood cuttings can also be taken in early summer.

Successful rooting often requires a humid environment and a well-draining propagation mix.

Repotting is generally not necessary for mature Nyssa sylvatica as they are large trees. For container-grown specimens, repot every 2-3 years in spring before active growth begins. Use a well-draining potting mix.

Choose a pot that is slightly larger than the current one to accommodate root growth.