18 hour blues

I am growing some Jack Flash plants which were doing very well under a 24 hour lighting regime, until someone told me that 24 hours was too much, and that I had to use an 18 on, 6 off regimen. I changed the lighting. A week after, most of the plants were showing sex and had slowed their growth. I want them to stay in the vegetative stage, so they can grow more. If I stay on 18 on, 6 off, will the plants go back to the vegetative stage?
Will there be any problem when I’ll want to make them flower on a 12-12 regime?

How can I get them back to vegetative stage?

Cactusman,
France

To get the plants back to full vegetative growth stage you need to turn the lights on continuously. The plants will revert to full vegetative growth.

If you maintain at 18 hours of light, the plants will show some signs of flowering, but continue to grow vegetatively as well. They will continue in this ambiguous stage until they adjust to the new regimen, then vegetative growth will continue.

Once the cycle is changed to a regime with 12 hours of darkness each night the plants should switch to flowering with no problems.

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