The arnold hawthorn is a deciduous shrub found in eastern Canada. Used for landscaping patios and lawns, arnold hawthorn also provides cover and food for wildlife such as birds and rabbits. Used in jams and jellies, the fruit of the hawthorn is sometimes used to treat high blood pressure. The arnold hawthorn grows between 15- to 30-feet tall and has oval shaped leaves and white flowers in the spring. The twigs are gray and brown and bear large thorns. Arnold hawthorn is found growing along streams and wetlands and prefers excessively moist soil.
Prune arnold hawthorn in the winter of early spring. This facilitates hardy growth for the next season.
Cut the tops of the arnold hawthorn using pruning shears, and prune the top ends of stems and branches. Prune all side limbs that are deformed and old. Remove all branches at least 10 inches from the ground while keeping the overall shape of the shrub.
Prune a broken or diseased branch by removing the entire branch. Remove all insect-infected branches to avoid contaminating the rest of the plant.
For young arnold hawthorn shrubs, prune to one central stem, keeping 2 to 4 stems on either side of the plant. This will free up nutrients for the rest of the plant and allow for hardy growth.