My Dad collected the seeds from a large ginkgo tree, grown from seed by Herman Deege in a small Illinois town. He taught me about the origins of gingko trees. I imagine he's been dead since the 1970s.
This tree is many-fold larger than the other two from the same source. Other than genetic diversity, different seeds from the same source, this was planted in the ground about one year before the other two. It is in the yard area where the dogs leave their contributions to nature, over the past 12 years. I think the dog fertilizer is the main difference.
It should turn yellow soon. Beautiful in green or yellow.