Was thinking the same thing, this morning, and for the last couple years. Mother Nature has been doing this for a few (million) years, so it's doable, for sure. I've found strains that will, & does, just drop seeds and the seeds pop, quickly. But for you, all that's needed is a strain that feels 'at-home' in your area. First, I would do the search and find out, & make a list of the max & min. temps for the last 5 years in your area, and the humidity, rain fall, elevation and day light hours per month. But maybe, you may cut to the chase, and get the miles that the Equator is away from your area, and make note of all the Countries that match that same distance north of the Equator, and all those south of the Equator, same miles way. Also, like the Kush Strain, it's native to the Kushistan (?) Mountains in Afghanistan, which means they thrive in colder temps. Stay away from hybrids, seek only land race strains. There may be a strain in the mountains of China or Russia that would thrive in your area. Also, on this site, about 4 months ago, I seen a post where a Guy used a certain strain in the colds of Canada that done really well.
Once a strain(s) has been decided upon, ( I would plant 6" or taller to begin, instead of dropping seeds) the placement of the grow spot is now of most import. First, the South side of a mountain or hill is important. A tree wind break on the north side is a good thing. An area where full sun is available from all points east, south & west. The grade of the area should be as close to level as possible. This is where I would plant as many as possible. A female plant can make 2,000 seeds per plant. Rain wash & wind will spread some. Birds & seed eaters will eat some, or a lot. But overall, the next Springtime, you should witness a beautiful sight, 100's of Babies reaching for the Sun. A little DE spread at this time will keep a lot of bugs from eating the babies. It would be very interesting to watch,.. after 3 years, kill the males, gather 500 lbs, of bud, and retire. Just a thought.