when is the best time to start my 12 12 flowering cycle what am i looking for

i decided based on space... i knew that if my plant could triple in height during 12/12, that i had better change the cycle when my plants got to 18 inches so i wouldn't risk getting taller than 4.5 feet.

i've read somewhere that it is ideal to grow the plant until it starts showing alternating nodes, because that's the plant showing that it's fully developed and ready to flower.

mine did start to show some alternating nodes by that height, which makes me feel pretty good about things...

__________________
cheers ~LoveIt
check out my current somango/ww grow! (and don't forget my 1st bagseed grow journal- cured and in')

about 8-10 weeks before you want to smoke some weed

and NOW you KNOWM

__________________
SeeMoreBuds
HOW TO GROW MARIJUANA - 15LBS IN 80 DAYS
www.SeeMoreBuds.com

so your saying that it will grow taller faster in the 12 cycle? whats a good way to control hieght

There are several ways of controlling height, topping, FIM'ming, LST'ing ect.
You can find guides on these methods in the GrowFaq at the top of the page.
You will notice once your plants go on 12/12 they will in fact speed up their growing but that should never be a substitute for allowing them to properly veg.

__________________
I've got 1.21 Jiggawatts and its still not enough!

Depends on strain. Indicas will grow an extra 2 inches maybe and then stop. Sativas will constantly grow.