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.