So Im trying to do my layout and I was wondering how tall will the colas grow above the scrog netting
You never can know unless you have grown it already. Like when you run multiple strains under a scrog some grow taller then the others so I would really suggest that you make it adjustable for height(raising it up and down). Sent from my Nexus 5 using Grasscity Forum mobile app
well the reason I ask is that Im in an attic turned bedroom so my walls are only about 2ft tall before it follows the roof line
The more leaders you have the less it will stretch. You can keep growth under the screen for a few days in to 12/12 to keep height down. Having low profile reservoirs and the screen not far off the reservoirs will all help keeping the hight down. My colas get to about 18-24" but I have a 6.5' tent