When should I change light into 12-12 ?

lowrider2000 said:

nope no effect on potency thats on the lights you have temps and genetics

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Dear lowrider
what light & temps make high potency?

Let your plants tell you when to switch the lights. Remember, we adjust the light cycle to HELP the plant flower. Any plant will start to flower, even in veg mode, if it is time to flower. Your gals are healthy and likely growing about an inch a day. They should continue at that rate until they start to flower. The smaller the pot the sooner they will start flowering. So watch your girls and look for small pre-flowers growing in the leaf folds. That is a signal the plant wants to flower and that is the ideal time to go to 12/12. BigSteve - 2 plants a week in perpetuity (I hope).

This article may help you.
http://www.marijuanagrowershq.com/when-to-begin-flowering-indoor-cannabis-plants/

I say whenever you want, if from seed. If from clone, wait for root establishment, if from revert clone, till the top leaves look a bit normal. Any way you look at it, those are just what i say to allow yeild to be optimal. If you dont care if all tricombs are amber and plant is k/o'ed and its half the size you want, then just do what you want.

When size becomes an issue. Keep in mind there will a stretch when you flip over that will double and I've even heard possibly triple the size.

K J said:

When size becomes an issue. Keep in mind there will a stretch when you flip over that will double and I've even heard possibly triple the size.

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YEA THIS! If your grow room does not have 8+ vertical feet like mine, you need to consider this! I've had plant's in a mere 2.5 gals worth of soil go almost 6 foot from floor (including bucket) Granite the bottom foot of plant was all stem since i trimmed all the foliage to put the most energy into the buds. Rule is about 2 foot per gallon by my standards (if there thriving) 1 foot if there a bit scrawny and not doing the best. If you do not have much vertical space, and still want horizontal monsters, buy chicken wire, or netting or something... drape it at your vertical cut off, as plants hit it, or before, move there pots further and further from light, so the top colas are growing towards the light and are closest, and the grow medium goes further and further from the light. It will be very difficult to move the medium if its crowded and confined space though, so at some point, you may need extensions long as shit, and watering wand's.