This is something I have seen people do and I swear it depends on the soil. I have a friend who just threw seeds behind his garage and did nothing else. A few months later, we noticed quite lush marijuana plants growing in good health back there. Not a whole lot of sun even reaches the area but it must have been enough.
Now is this a case of good soil or something I am missing?
Just because the plant grew back there doesn’t mean it is any good. I have found some plants outside in the middle of parks, likely from smokers tossing their shake at the bottom of the bags on the ground. The plants were no good in terms being smokable. The buds weren’t stick at all, just dry and bland in taste and scent.
You can grow just about anything if the temps are right for it and the weather sustains the plant’s health on its own. Weed can grow in some pretty crappy considerations but in a lot of cases, they don’t bud properly.