Red Mulberry is a deciduous tree, growing to 10-15 m tall, rarely 20 m, with a trunk up to 50 cm diameter. The leaves are alternate, 7-14 cm long and 6-12 cm broad, simple, broadly cordate, with a shallow notch at the base, typically unlobed on mature trees although often with 2-3 lobes, particularly on young trees, and with a finely serrated margin. The upper surface of the leaves is noticeably rough, similar in texture to fine sandpaper, and unlike the lustrous upper surface of the leaves of White Mulberry (M. alba). The underside of the leaves is covered with soft hairs. The leaf petiole exudes milky sap when severed. It is hardy to -25° Celsius (USDA Zone 5).