Morus alba, known as white mulberry, is a short-lived, fast-growing, small to medium-sized mulberry tree, which grows to 10–20 m tall.The species is native to northern China, and is widely cultivated and naturalized elsewhere (United States, Mexico, Australia, Kyrgyzstan, Argentina, etc.).orus alba, known as white mulberry, is a short-lived, fast-growing, small to medium-sized mulberry tree, which grows to 10–20 m tall.