Regular watering is crucial for young trees, especially during dry spells, to establish a strong root system. Mature trees are more drought-tolerant but benefit from deep watering during prolonged dry periods to maintain vigor and prevent stress.

Pruning for Horse Chestnut trees should be minimal, primarily focusing on removing dead, damaged, or diseased branches to maintain overall tree health and safety. Structural pruning to improve the tree's shape, enhance air circulation, and allow better light penetration within the canopy is best performed in late winter to early spring, before new growth emerges.

Horse Chestnut trees are commonly propagated from seeds, which require a period of cold stratification to break dormancy and ensure successful germination. Collect seeds in autumn and either sow them directly outdoors or store them for stratification before spring planting. Grafting is another method, often used for specific cultivars to preserve desired traits and ensure genetic consistency.

Given its large mature size and long lifespan, the Horse Chestnut is not suitable for long-term container cultivation or regular repotting once established in the ground. Young saplings grown in nursery pots should be transplanted to their permanent outdoor location as soon as they are robust enough, typically within their first few years, to allow for proper root development.