This is from one source on SCROG,
" Vegging: Here is where alot of people make
mistakes. They get in a fired up hurry and get
confused somehow. Flip their plants over to 12/12
way to soon and wonder why their screen never
filled up. At that point the screen is nothing
more than a support system for the plant. Normally
one would veg a plant till the screen is 70-80
percent full before switching over to the
flowering cycle. Having knowlege of how much your
strain stretches is helpful when determining when
to switch to flowering. For example: If one had a
very stretchy sativa. You would want to start
flowering her with much less of the screen filled.
Just the opposite for a nice stunted indica."
scrog :: DevilsHarvest.com
Adieu