How do you take clones from a vegging female when while she is vegging you don't know her sex?

Thats the point. Take few clones off the mom. Flower the clones. Then you will see what sex the plant is. If its male detroy the clones and mom. Once you have determined its female take clones off the mom and grow them up then flower them. You keep the mom for an endless supply of female clones.

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cant you just flower it and revert the clones and mother into veg by just switching the light cycle back? or will this increase the chance of herms?

You can do that but I believe the plant loses some of its potency like that. I have done it myself. So yes it can be done. Just switch it back as soon as you see flowers.

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yeah ive heard some things like that. so i just relied on prayer and karma for females haha

I believe talking to them works too

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always man! they loooooove the dirty talk hahah

Widow is right, the best way to do it is to take clones from the plants you have (remember to label corresponding clones to mothers) put them in a clone room and flower them, this way you don't loose any time when reverting.

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cheers lads. We're going to convert an airing cupboard and put a few hundred watts worth of luminous bulbs, hopefully enough to veg them. low energy bulbs that have 60 watts are converted into 100 watt bulbs. Are these sufficient for vegging?

Also with the money we get from the 1st crop we are going to invest in an aeroponics system to house 40 females. Seems a bit of a big step to me, but we've got a geezer coming over who's been doing it for 15 years (growing in general). He swears by aeroponics, claiming stems as big as his wrist, this guy isn't far off 30 stone and about 6'8", claiming buds the size of half a nine.

Sounds good to me and we can buy the complete system for 20 plants for 309 Sterling, we'll be having two.

Also, due to this geezer, we have now stopped vegging our plants after 3 and a half weeks. turned the lights off for two days whereby he says we should see the sex of the plants, or not long after, when we turn the lights back on tomorrow. After we turn the lights back on they will be on a 12 12 cycle. Which means our crop will be dry, ready to smoke before or around mid-november. he said that our plants are already a decent size and are ready for flowering.