Bradford Pear, Pyrus calleryana, (Callery Pear) 30 Tree Seeds (Fast, Fall Colors) Bradford Pear, (Callery Pear), Pyrus calleryana, 30 Tree Seeds Flower: Large (2 to 4 inches across) clusters of showy white flowers (1/2 to 3/4 inch across) appearing in early spring, before or with the leaves. Often so dense the entire tree appears white. Zone: 5 to 9 #Growth Rate: Fast #Plant Type: Deciduous Fruiting Tree #Family: Rosaceae Height: 30 to 50 feet #Spread: 20 to 35 feet Site Requirements /Soil Tolerances: Humusy, well-drained loams with consistent moisture. Tolerates some drought once established. Adaptable to a wide range of soil conditions including heavy clays. Tolerant of urban conditions. Should be protected from strong winds.