Seeds in the wild must survive winter and reproduce, but I wonder how the odds compare to putting the same seeds (untended) in at springtime, 43° North. Would spring double your odds, for example, or more? What do you think?
Those are the wild Plants i told about (pics not from me, but i think its very interesting)
I had a guerilla growing Scandinavian friend who told me once that he accidentally one time started a self maintaining wild population. (He was producing seeds to sell). After a few years he saw those 'wild' plants start popping up all over the area.
He had to change location because of it due to safety risks.