im doing a scrog right now and plan to veg them to only about 12 inches before they hit the screen. then everything after that will fill out the screen a bit. i might actually drop the screen to about 10 inches after all is said and done. since it will be growing horizontal instead of vertical the plant will be longer from soil to tip than it will be tall since the screen is holding it down. you could continue to veg it under the screen which is what i am doing. might reach 18-24 inches before it goes into flower. so long as the screen is filled up it doesnt really matter how tall they are or how long you veg.

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