I know I've seen potted trees, usually about 5-7 feet tall in pots
between 24-48 inches wide, used in patio gardens. However, I have been
unable to find a suitable tree at any of the local nursaries. Many of the
potted trees I have seen appear to be ficus or orange trees, which won't
grow perrenially in my zone. Does anyone know of a dwarf tree that can be
potted and will grow in the region between zone 4b and 5a (Iowa City)? I
live in an apartment and have no plantable land. I'm tring to create an
italian-style patio garden and I need a focal point.

Thanks,
Adam (Iowa City)