Hawthorns are deciduous trees in the apple family that are often used in the landscape because of their attractive clusters of white or pink spring flowers, dark green leaves, appealing shape and size (usually between 15 to 30 feet tall), and bright red berries that attract birds in fall and winter. They are susceptible to several diseases including fire blight and several types of rust and they are troubled with a variety of insect pests including lacebugs, leafminers and roundheaded appletree borers. If planting a hawthorn tree look for disease and insect resistant varieties.