Another note, back when I was in college at Iowa State, I collected a bunch of ginkgo seeds (actually, the fruit that smells like puke) and germinated 7 of 11. 3 are still in the ground at my buddy's house in IA, 1 is in the ground here. The other 3 died somewhere along the many moves over the last 15 years.
The ones in Iowa are getting big, and I'll be bringing one home next year. Again, it's got that flame shape, and it has been simply trunk-chopped every couple years. They've got 4" trunks now, and aren't much more than 20" tall. The one at my house has been in and out of the ground several times. Is not more than 1.5" in diameter. It will be interesting to do a side-by-side when they're reunited.
Here is a photo of the lawn on campus at ISU taken in the 1950s, and those ginkgoes my seeds came from are in the foreground. I'll have to find another more recent photo. The grove is very impressive.