Can I go from Flower to Veg?

Hi, I have 5 plants atm but I only want 1 or 2 so I need to sex them soonish before they take over and my lights become useless. I have 100watts total (20watts each bulb) and just want to grow some decent bud. Can I go back to veg after they show sex and continue growing them bigger? Is that how it even works? ANY advice is welcome I'm a noob, Cheers.

I'm a noob too, but i believe you can. After they show their signs of sex, change the light cycle back to 18/6 or 24/7. They should revert back to Veg and get bigger and bigger.

Yes you can do it. They will grow weird just to let you know. Like your plant will look like a mutant. But it will grow. If you can take a clone from each one and sex them. That was you don't mess with your big girls and you will know what they are. But to answer you ? Yea you can do it. STAY HIGH.

I like Penyajo's suggestion.

If you put a girl to flower and switch her back to veg she'll need lots of time to recover.

If instead you take a cutting and root it (this is a clone) and put it to flower you'll find out the sex of the original plant (clones have identical genetics to their mothers).

Re-veg can take 6 weeks or more. Rooting a cutting can takes only a week or two.