Callery Pear

Pyrus calleryana (Rosaceae) is a deciduous tree native to China, Vietnam, Korea, and Japan. It grows 30 to 40 feet tall and 15 to 25 feet wide with a pyramidal to oval form. Dense clusters of white flowers appear in early spring, followed by small, hard, brown to black fruit (about 1 cm). Fall color ranges through bronze, orange, purple, red, and yellow.

Callery pear tolerates a remarkable range of urban stresses: heavy clay, compacted soil, poor drainage, pollution, and drought. Originally introduced in 1908 by the USDA as fire blight-resistant rootstock, the cultivar 'Bradford' (released 1962) became one of the most widely planted street trees in the United States. However, cross-pollination among cultivars has produced invasive seedlings that now infest disturbed areas across the eastern U.S. Many communities have restricted or banned new plantings. The species carries 25 documented diseases and 11 pests. Hardy in Zones 4b to 8b.

Callery pear ranks among the most common flowering trees in residential and commercial landscapes in the Puget Sound lowlands. It handles the wet winter/dry summer cycle without irrigation once established. Note: increasingly recognized as invasive due to prolific self-seeding from cross-pollinated cultivars. Performs well in local heavy clay soils. One of the first trees to bloom each spring—useful phenological marker for seasonal transition. Primary bacterial disease concern in this region is Pseudomonas blossom blast, NOT fire blight (per WSU: 'Fire blight is not a proven problem in western Washington'). Pear trellis rust is commonly reported where junipers are nearby. Monitor for invasive seedling establishment: cross-pollination between cultivars (especially where multiple cultivars are planted on the same street) can produce fertile offspring.

— HortGuide editorial