Interesting ....
I just found a couple of plants that got started in between the ragweed and goldenrod in a compost pile I let go cold. Likely from a plant I tossed in when the compost pile was steaming, and the seeds didn't get killed. Both plants were female, but no males. Both plants were full of seeds. Smoke was pretty good, even quick dried. Likely knocked back by an early frost and cool dried 10 days before I found them.
But I could not avoid old-school seed sorting ... oh, where have the single-fold record album covers gone?
The question becomes for you and me, where did the pollen come from?
I'm afraid the answer was three miles upwind of me -- a CBD plantation.
I've also found seeds in store-bought flower. Not a lot, but I do wonder where the pollen came from. Hermies? Or simple air migration, and lack of effective pollen control?
Now that Hemp and CBD cannabis is legal to grow openly, and more and more states allow legal grows, I'm thinking there is more and more of a chance that "wild" pollen can infiltrate our systems. It's why I've added HEPA filtration into my grow room. Double-filtration in my breeding box.
FWIW.