Quick question with pictures. SCROG

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Hey guys and girls, i'm close to my 4th week of veg from sprout. I have 5 different strains from attitude, a bunch of Dutch passion and another.

Just wondering when I should throw the screen on top of them, I only have like 2 or three weeks of veg left untill i switch to 12/12. Im a little worried I wont be able to fill the screen like I thought I would.

Cinderella
Brainstorm
White Widow
The Ultimate
Vanilla Kush

and some random bagseed i just sprouted that wont be in the scrog.

i'd really appreciate some useful feedback from as many people as possible

Maybe ill have better luck this time...

I'd appreciate any advice as far as my future scrog plans go

please, experienced scroggers

you can screen it when ever you want. Fill it half way up and then switch to 12/12

with another three weeks of veg, will i be able to fill a 2.5'x3.5' screen with the 4 possible 5 plants im working with?

Three more weeks plus maybe another week before the stretch really kicks in, you should easily be able to fill the screen.

okay well three weeks is all I have to work with as far as vegging goes.. so thats good enough for me. I may make it slightly parabolic if these girls really do it for me and I can fill it.
Thanks GrumpyOldDreamer+rep.. gave me an answer I havent found while researching.