Red Mulberry Tree: A Native North American Treasure

Overview

The red mulberry (Morus rubra), also called American mulberry, is a deciduous tree indigenous to North America. While it shares similarities with white and black mulberry species, it stands apart in size, native range, and growth habits. Despite its name, the tree produces a deep purple-black berry that closely resembles blackberries or black raspberries in appearance and flavor.

Description

Red mulberry leaves are broadly oval, measuring 4–10 inches across, with serrated edges. They may be simple or deeply lobed. A key identifying feature is the pale, hairy underside of the leaf, which distinguishes it from the smoother leaves of white or black mulberry. The branches grow in a distinctive zigzag pattern with alternating leaves. Young bark is grayish-tan and relatively smooth, becoming furrowed and rough with age. In early spring, the tree produces male and female flowers in 1–2 inch catkins. The fruit is an aggregate of tiny drupes forming a juicy, sweet-tart berry about 1–1.5 inches long.

Growth Habits

Red mulberry thrives across the central and eastern United States and into Canada, spanning USDA zones 2–11 and tolerating sub-zero temperatures. It naturally occurs as an understory tree in hardwood forests, favoring moist bottomlands, floodplains, and rich, well-drained soils. The tree grows rapidly, adding over two feet per year in ideal conditions, but is relatively short-lived, rarely exceeding 75 years.

Form

In optimal settings, red mulberry reaches 70 feet tall with a short, broad trunk and low, spreading limbs that create a rounded, medium-density canopy. The long, drooping branches give the tree a coarse texture and graceful silhouette.

Culture

Red mulberry prefers full sun but tolerates partial shade. It adapts to a wide range of soils—sandy, loamy, or clay—provided drainage is adequate. The tree withstands occasional flooding and, once established, shows good drought tolerance. Maintenance is minimal. Propagation is achieved via seed or hardwood cuttings. A practical note: avoid planting near walkways, patios, or driveways, as the abundant fruit drop can cause stubborn stains.

Uses

Valued as a shade and ornamental tree in landscapes, red mulberry also provides delicious fruit for jams, jellies, pies, and wine. The berries are a vital food source for birds and wildlife. The wood is light, soft, and close-grained, making it suitable for fence posts, barrels, furniture, and interior finish work.