Cool thread. I have to respectfully disagree that a solo cup grow is a waste of time. I mostly grow in ten gallon pots, but the inconvenient truth is that one of my solo cup plants, grown 12/12 from seed, far outyielded my regular plants when factoring in the size and especially that it only took 101 days from sprout to harvest.
I haven't quite got my head around that. Makes it seem like, in yield terms, I should be growing all solo cups- I just don't want to!
Mine was in coco perlite, under an autowatering system. I've been trying to take it to the next level by doing the same thing but in one gallon pots, -keep failing to replicate the magic though.