I have unintended experience in a couple of scenarios:
1. Potatoes definitely appear ‘when the time is ripe’ when you didn’t manage to get every single tuber from the ground one year previous. So I do suspect that you don’t need to ‘chit’ potatoes and you could probably put them in the ground in late November.
2. Tomato seeds ended up in the compost from kitchen waste miraculously started growing in May amongst my parsnips and elsewhere. I”d put the compost down in early March. I let one Maskotka plant keep growing and harvested a few.
I think that neither of those two would be used in that way in the normal scheme of things in the UK, although I think that if you decide to create ‘permanent beds’ where you simply grow the same crop each year and either let the seeds fall down or you leave a few tubers in the ground, it might be worth doing.
Obviously different people have different views on whether that’s a good thing. In nature, you have to say that the natural cycle of vegetables is to keep growing in the same place and then occasionally have a bird or whatever eat some seeds and drop them at a new location. Some permaculture proponents also say this works very well, but of course there are plenty who say you will encourage disease.
I wonder if it is all down to the quality of the soil?