It stands for Balled and Burlapped, which is similar to a potted tree. The tree is grown in the field along with our bare-root trees. However, this tree is dug in a way that the soil around the root is spaded out of the ground and placed in a wire basket that has been lined with burlap. Then it's tied tightly with twine to secure the root-ball that has been formed. The roots are much less disturbed with this transplanting process.