Right on, the nanners can happen to a lot of plants, or most if not all actually, if let o past their ripened stage. I think all plants can herm, some just easier than others, and we just need to find out what triggers it for a certain strain, and then not do that lol. For example, some plants don't like heat, so heat could cause a plant to herm (user error and avoidable) or even a big light leak undetected in flower or even too much fertilizer. Just user stresses pretty much. But, then there are full hermie plants, the ones that are 1/2 nuts and 1/2 pistils, those should be killed on arrival because those are just built in their DNA to herm full blown
Green Crack was made in my County I hear