id say the easiest option is the clone method, take a clone when you have buds formed and just use one of the lower branches and you will then have a monster cropped plant when its back in veg.
now ive not had any problems with doing a reveg of a plant after harvest, all mine reveg just fine, but 3 members on here have given it ago and all 3 plants died and never went back into veg, all i do is harvest the plant and leave a few lower buds on it, just 2 or 3 is all thats needed and then i put it under veg and 3 weeks later its back in veg, so far all mine have lived to grow again.
ive not tried putting a plant into flower then into veg without harvesting it first, but this method should produce the same results as taking a clone during flower then putting that back in veg, but the only downside is you have 3 weeks before the plant goes back into veg so them 3 weeks you lose as the plant does nothing at all and wont be back in veg till week 3 of the veg schedule.
so id say if you want to experiment with this method then go down the clone option, removing some lower buds helps the plant produce bigger buds up top, plus you can then see how the plant flowers and how nice the buds are, then you can either keep the clone or kill it if your not happy with the results, but if you put a plant into flower and let it start flowering then put it back in veg you wont know the end results until its back in flower and harvested, so personally for my first try id go down the clone route,
that way you can flower the plants when your ready and you wont be pushing the harvest back any longer than you want, 3 weeks is a lont time to add onto the grow so you will lose 3 weeks just putting the plant back in veg, so using clones week 1 the clone grows roots, then 2 weeks later its back in veg and growing well.
its quicker than planting another seed using the clone method.
also all plants will show sex under a veg schedule, now mine usually show sex around week 6 of growth under 18-6 or 17-7, if you use 24-0 for veg then plants take much longer to show sex and ive had strains that dont show sex at all under 24-0.
i like to make sure my plants are mature before i put them into flower as this cuts down on the stretch period, if you flip 12-12 before the plants mature then the stretch period is longer as the plant has to mature before it starts flowering, so if the plant is fully mature when you flip 12-12 then plants can start flowering as little as 1 week after 12-12, plants not mature will easily have 21days or more of stretch before they start flowering.
but at the end of the day its your choice, if you go 12-12 then want to flip back to veg then the plants need to be far enough in flower for it to turn out monster cropped, so id go with the clone method, you could take a clone from each plant then reveg them then once you have sampled the buds you can decide which clones you want to keep or not keep depending on the results.
im pretty confident your friend is right about the fem seeds. if the method used was the rodiliation method which im sure it was then they should be femenised seeds, this does not mean a male wont grow from the seeds but highly unlikely, so far ive not had any males grow out of my own fem seeds,
the only time ive had a male grow from a fem seed was when i purchased a jack flash for herbies, it turned out male so let him know it wasnt souvineer quality and he replaced it with 2 jack flash fem seeds the next time i placed an order, just about to harvest the one in the next day or 2 then if the quality is their ill keep the clone and give it a longer veg time
