Hei Eric,
thanks.
I have 5 Magnolia Grandiflora Trees (4x Goliath, 1x Gall. Nana).
It´s one of ma favourite tree. Nice Leafs, big flowers and evergreen...
Also a nice habitus.
Another advantage is the flowering time from June to September.
Try Magn. Grand. BBB or Alta too, which also have a very good winter-hardiness.
MvH