Washington Hawthorn prefers consistent moisture, especially when young. Water deeply and regularly during the first few years to establish a strong root system.

Once mature, it is quite drought-tolerant but benefits from occasional watering during prolonged dry spells to maintain optimal health and flowering.

Prune Washington Hawthorn in late winter or early spring before new growth emerges. Remove any dead, damaged, or crossing branches. Light pruning can be done to shape the tree and improve air circulation.

Avoid heavy pruning, as it can reduce flowering and fruiting.

Washington Hawthorn can be propagated from seed, which requires a period of cold stratification to break dormancy. It can also be propagated from cuttings taken in summer, though success rates can be variable.

Grafting is another method, often used for specific cultivars.

Repotting is typically not necessary for established Washington Hawthorn trees planted in the ground. For container-grown specimens, repot every 2-3 years in early spring, moving to a slightly larger pot with fresh, well-draining potting mix to accommodate root growth and prevent root-bound conditions.