I gave up on boxes many years ago and find the 'papoose style' that was
first created by Dan Robinson as the cheapest and most efficient method of
training on a tree that is field dug. Chicken wire cut to length, landscape
cloth cut to fit, add your growing medium, place tree, tie up tight with
wire and you have a fully contained growing pot with a perfect fit for each
individual tree. You do not have to prune back roots to make it fit, the
chicken wire adapts to the shape.

As time goes by undoing the wire is simple and you can easily remove or add
soil or root prune to any portion of the root ball with out destroying the
integrity of the rest of the root ball or the papoose. Also it is easier to
get the growing medium around the roots and there are no dead spaces under
the root system, by wrapping the wire tight prevents the tree from shaking
and thus prevents small roots from breaking off. Drainage is exceptional and
the papoose last as long as the quality of the landscape cloth used.
One roll of chicken wire, one roll of landscape cloth, medchanics wire will
do about 20 trees depending on size.
I do this sometimes right at the collection site and do not have to worry
about soil falling off or damaging any roots for the trip home.
For what it is worth
Anton

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