Red Horse-Chestnuts prefer consistent moisture, especially when young. Water deeply during dry periods, allowing the soil to dry slightly between waterings. Avoid waterlogged conditions, as this can lead to root rot.

Mature trees are more drought-tolerant but benefit from occasional deep watering in extreme heat.

Prune to remove dead, damaged, or crossing branches. This is best done in late winter or early spring before the leaves emerge. Shaping can be done to maintain a desired form, but avoid heavy pruning.

Ensure cuts are clean and made just outside the branch collar.

Propagation is typically done through grafting, as seeds from this hybrid may not come true to type. Grafting is usually performed in late winter or early spring.

Another method is collecting seeds in autumn and sowing them in a cold frame, though germination can be erratic.

Repotting is generally not applicable to mature Red Horse-Chestnuts as they are large trees. For young container-grown specimens, repot every 2-3 years in early spring before new growth begins.

Use a well-draining potting mix and a slightly larger container.