HI!
What is B and B in the palm and tree world? It means BAG and BALL.
Okay, so what does that mean?
If there are very large trees, normally, in transplanting it is easier and safer if the trees are wrapped in plastic or burlap when they are dug. When we Bag them, the earth is damp and it preserves the moisture during transportation and planting. It is also actually easier to manoeuvre around planters or buildings to the hole.
Originally, the bag was a burlap type and burried to decompose. Now, we use plastic to protect the moisture and roots.
We have sent many B and B palms to South Carolina and it's easier on the other end to remove them from the trucks.
The big specimens in boxes, they have to be gigantic boxes. are expensive which translates into more cost for the customer. And, it is better for them to root a bit in the boxes for awhile. The problem with many boxed specimen is this; Craning them up can rip their roots sending the tree or palm into distress. Many boxed trees have established root systems through the bottom of the boxes.
Digging, wrapping and out is a better and more successful process in transplanting.