Black Walnuts grow wild in the woods in our area of southern Wisconsin. These look like three little green limes, still hanging from the branch of the tree. The bright green outer shell is soft and pithy and eventually falls open to reveal the thick, black crinkled nutshell beneath. They are best dried a bit before being used, but are smaller and more bitter than their cousin, the English Walnut. These will most likely be harvested by the local squirrels!