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How would I reveg a plant if I like it's traits, but want to harvest the bud? Can I carefully cut the bud and leave the fanleaves then go 18/6 with the lights?
you can re-veg a plant, no problem. i've done it first hand. i've got some pics in my old grow logs. i'll see if i can't find some. keep some of the lower growth on the plant, more than just the fan leaves. if there's not much then keep a few of the small buds. i would suggest trimming the rootball and putting it in a smaller pot with some fresh soil. start light on the veg nutes and put her back into veg. the growth might be funky and gnarly at first, and even some single, double or triple-bladed and possibly non-serrated. just keep her in the light and keep feeding her veg nutes. she'll be fine. rust has a thread on it.
this is a bad idea... even if you cloned the budding plant and reverted it back to veg, it would always be a stressed out plant... and would never produce well. I would not recommend ever doing this, especially to a plant that you want to be a mother!
have you given this a try? it will not always be a stressed-out plant. the re-veg would be a fine mom (perhaps a better one as there will be more, thick growth from the get go). a clone would do just as well as it is a 100% genetic replica.
i do agree with you that a stressed plant will give stressed clones.
the second harvest could be as good, if not better than the first as their are more shoots and growth sooner on a re-vegged plant.