Standard Chinese elm is hardy in the ground in Zone 5, so it and 'Seiju'
should not be a problem in the Philadelphia area.
However, 'Seiju' and probably other Chinese elm cultivars may not actually
drop their dead leaves until January. If you are going to pack them up in a box
or plastic for the winter, you need to remove all the dead leaves by hand
first. My 'Seiju' winters in an unheated sun porch, so I can let the dead leaves
alone.
Iris

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