I have one on my yard. they are huge and full of flowers in the first week or so of May here.
Apparently the tree is not supposed to survive in the zone that I am in and talking to an expert on the tree.
Since some of the flowers are females and some of the flowers are males.......only the seed pod will drop from the female flower
they self pollinate..
apparently the tree out front here was 45 before it first bloomed. I bought this house a year and half ago and did not even notice the blooms although could smell them last year. then someone told me that it is a tulip tree.
this one out here is 80 Feet or more tall and on a good year can produce 700 flowers.........
a lily expert around here said that out of the seed pod some of the seeds should germinate...but they would need a cooling off in the fridge and then planted back outside again
hope this helps