The Nile Black Mulberry tree was originally found growing alongside the infamous Nile River in Africa and is known to produce a rather large yet long and sweet mulberry. The Nile Black Mulberry tree is both cold hardy down to negative 10 degrees fahrenheit and can tolerate scorching hot summer temperatures. The Nile Black Mulberry tree is a must-have in your garden if you are wanting to pick and eat big sweet mulberries. You can expect two crops from this particular specimen, once in the early spring and  once in the late summer. (USDA Zones 5-11)