I dont know where it came from but I do know its a fert whore. Once your plant is at full size, like a foot tall it will consume any fert you give it and want more. I mean you can't pour the whole bottle in but you should be able to go past the recommendations on the bottle, if you work you way up slowly. The OG kush I grew had rock hard nugs, most OG's have rock hard nugs.

So you bought a dank G and freaked with joy when you saw the seed. You should chant every night while holding incense and prance in a cirle around the plant, this will make sure its a female. And if it is a female then you should make the strain into a Momma Plant by removing two clones as soon as its big enough. The clone becomes the mothers so you can flower the plant and have medicine faster.