You didn't say how much time has passed. It takes quite some time for a plant to switch from flower to veg. I've had some that take as much as a couple of months to show any real progress. It seems like they just sit there doing nothing for weeks on end when in actuality they are reverting back, you just cant see the progress. That said, I never tried it on plants as young as the ones you are attempting to reveg. Usually I reveg only a harvested plant that I missed cloning for one reason or the other to keep a good strain. I have a couple in my grow room now That have been reveging for a month now and are just starting to show good vegitative growth ( THC BOMB )
I haven't investigated wether 24/0 or 18/6 is better for doing this, but if I had to hazard a guess I would put them under 24/0 for a couple of weeks, then go back to 18/6 for the duration. The reasoning is that the 24/0 would 'kick start' the reveg process. I don't know if that is actually true or not, but it works for me anyway.
The time it takes to reveg is why its not a common practice, as it can add as much as a couple of months to the timing of your plants cycle.
Have patience, its like watching grass grow.
