Larches work the same way. Gingkos are no different but you have to see them in the lesser-known conical form. An interesting note is that today nothing eats gingko leaves. If there were forests comprised of either trees you might guess how high sauropods could reach based on what natural height these trees would reach before branching out into a canopy in a forest environment. Unfortunately neither of these trees has ever been seen in such a state.
Gingkoes can no longer propagate naturally without direct human intervention.
Insects nor birds seem to do the trick. Gingkoes have not been planted in forest-like situations and it would probably take two or three hundred years to find out if they were planted in such a way now. The stand was isolated and on a mountain which could further explain the apparent slow-growth of the trees and the dwarfed stature of them. Soil was also poor and dry. This combination of factors may have caused their reason for survival, stunting growth and retarding aging.