I think your trees will do OK; we have some seedlings in a naturalized
park here growing well with less sun. It's said to be often an
understory tree in the wild; seems to like some wind shelter. But as Lee
has pointed out, you need more sun for best fruiting.
My impression is also that they like moist soil and plenty of organic
matter, as you might expect with a bottomland tree.
Doug Woodard
St. Catharines, Ontario, Canada
[NAFEX] Pawpaws for Rich Chirumbole,
Douglas Woodard, 03/03/2010