Yeah right! I have never heard it before either, it was by mistake that i figured it out. About five years ago, I was in Montana and a good friend of mine started a medical grow and I helped him with the specifics, a consultation of sorts. Anyway, he sourced a "sour diesel" cut from his homie in the bay, I was skeptical because at the time the cut was closely guarded. So he set up a room to my specifications, co2 burner and all, and he killed it! His first run he did over 1.5 per light and that is impressive in my book, except that when his sour d finished it was not the sour d that I knew and loved. While it had some reminiscent characteristics overall it seemed like a distant cousin that I nicknamed sour weasel. About a year or so later I set up a grow of my own and we literally grew everything the same way as my buddy and the only thing I did not do was add co2 because of the cost of a burner. Well, at the end of the crop something was completely different with diesel and with all my strains (which were the same as his because I took cuts directly off of his mothers) and it was awesome!!! The weasel was no longer weasel, it smelled and tasted like skunky, funky sour d!!! So fucking good, and everyone including my buddy was aware of this, in fact it took him doing multiple runs before conceding that I was onto something. Now, I can almost call when most (not all strains react this way but almost every sativa leaning hybrid absolutely does) strains are grown with large amounts of co2. The looks, smell, and most importantly taste are very different. If you have a chance to test this, please do I don't think you will be disappointed at all.
By the way, my buddy was getting close to 2#s per light with his diesel grown under co2 and now from what I know the co2 is x'd out of his equation, harvest weights suffer but its crazy the quality that is made up!
