Quart plant of this Mimosa White Tree a very rare color in this tree. Mimosa or Albizzia julibrissin is a deciduous, small to medium-sized tree that can grow 10 to 20 feet tall in zones 6 to 10. It is a member of the legume Fabaceae plant family and is capable of fixing nitrogen. The bark is light brown and smooth while young stems are lime green in color, turning light brown and covered with lenticels. Leaves are alternately arranged and bipinnately compound 6 to 20 inches long, having 20 to 60 leaflets per branch. The leaf arrangement gives mimosa a fern-like or feathery appearance.