white mulberry (Morus alba) — identification, habitat & look-alikes

White mulberry is a tree native to China that grows wild across much of the United States, where it can spread ly and cross with native red mulberry. The glossy leaves may be lobed or unlobed on the same tree, and ripe fruit can be white, pink, red-purple, or nearly black.

Appearance

Appearance: This fast-growing tree usually reaches 30–60 ft (9–18 m), with a rounded crown and a short, sometimes crooked trunk.
Leaves: Leaves are alternate, toothed, and glossy above. They may be unlobed, mitten-shaped, or divided into three or more lobes, even on one tree.
Flowers: Small yellow-green flowers hang in tight clusters in spring. Male and female flowers are often borne on separate trees.
Fruit: Female trees produce cylindrical clusters up to about 1 in (2.5 cm) long. Ripe fruit may be white or pink, but it can also become red-purple or nearly black.

Look-alikes

red mulberryMorus rubra

White mulberry usually has a glossy, smoother upper leaf surface and smaller leaves that are more often lobed. Red mulberry leaves are dull and rough above, with soft hairs beneath; hybrids may blur these differences.

Why they get mixed upThe species overlap widely, have variable leaves, and hybridize in the eastern United States.

paper mulberryBroussonetia papyrifera

Paper mulberry has conspicuously fuzzy twigs and leaves and round, orange-red fruit clusters. White mulberry has smoother, glossier leaves and elongated blackberry-like fruit.

Why they get mixed upBoth nonnative trees can have deeply lobed leaves and grow in disturbed sites.

Three mulberry-like trees

	Leaf surface	Fruit shape
white mulberry	Usually glossy and smooth above	Elongated; color varies
red mulberry	Duller and rough above	Elongated and dark when ripe
paper mulberry	Hairy leaves and twigs	Round, orange-red cluster

Where it lives

Typical habitats: roadsides
old fields
forest edges
floodplains
Range: Native to China, it was introduced to North America for silk production and has escaped cultivation across most of the United States. It is especially common in disturbed ground, woodland edges, stream corridors, and urban areas.
Preferred conditions: It grows in sun or part shade and tolerates heat, drought, pollution, and many soil types. Moist, well-drained soil supports its best growth.
Flowering: Flowers Mar–Apr
Flowers Mar–Apr · Fruit Jun

Life cycle

Reproduction: The tree spreads by seed and can resprout from roots or cut stumps. It also readily with native red mulberry.
Seed dispersal: In the United States, birds and mammals, including red foxes and raccoons, eat the fruit and spread the seeds.

Cautions

Cautions: Ripe fruit is eaten, but unripe fruit can upset the stomach, and the milky sap may irritate skin or cause mild toxicity if swallowed.

Name and classification

Varieties and forms: North American plantings include fruiting, fruitless, weeping, and contorted cultivars. Leaf shape and fruit color vary widely among trees.

Conservation

IUCN Red List: LCLeast ConcernLow risk of extinction
Threats: In the United States, its main ecological concern is competition and gene flow with native red mulberry. Hybrid trees can make visual identification unreliable.

Culture and stories

Culture and stories: White mulberry was brought to North America in repeated attempts to build a domestic silk industry beginning in the 1600s.
Ripe fruit is used fresh or in preserves, but fallen dark fruit can stain pavement and vehicles.

11 sources