Rivalfish, I think the general view with guerrilla growing is that plants are best grown in pots first then put outside when they have a few sets of leaves - this is something I just can't do at the moment, hence my experiments with the wee cloches. I wouldn't recommend my method if an alternative was available.
With photo strains you can sprout seeds in tiny pots - 6cm root trainers will do - and then put them outside and they will grow full size. Autos on the other hand are trickier as being in small pots can easily stunt them. I'd say minimum 500cl/16oz pots would be needed - the taller and narrower the better, so maybe paper or plastic disposable cups rather than horticultural pots - and maximum two-three weeks in the pots or they can get rootbound (that's when the problems start).
With photo strains you can sprout seeds in tiny pots - 6cm root trainers will do - and then put them outside and they will grow full size. Autos on the other hand are trickier as being in small pots can easily stunt them. I'd say minimum 500cl/16oz pots would be needed - the taller and narrower the better, so maybe paper or plastic disposable cups rather than horticultural pots - and maximum two-three weeks in the pots or they can get rootbound (that's when the problems start).