Morus alba, known as white mulberry, common mulberry and silkworm mulberry, is a fast-growing, small to medium-sized mulberry tree which grows to 10–20 m tall. Morus alba 'Fruitless'–Morus alba 'Fruitless'. Morus alba 'Fruitless'. Grows from a large shrub into a medium-size tree from 8 to 10 m tall. By nature, often multi-stem, but also grown as an arbour tree (canopy). The crown is open and has quite tangled branching.