depends on what medium you choose. If you are doing a
soil grow, then using a 5, 7, or 10 gal. pot would do just fine. If you are looking at using
coco coir then you would want a smaller pot. ( I use coco, and am in a 2.5 gal, works great)
If you are using soil and are going to use a bigger pot, remember to start it off in a smaller pot, and up pot it. Planting directly into a large pot not only wastes nutrients, but it slows your growth. Something about having the roots somewhat constricted keeps new growth at optimal conditions. I have tried to plant directly into large pots when growing auto strains, because they don't take well to transplanting. Growth was at a snails crawl, so even when growing auto-flowering strains, I start them out in a solo cup, or equivalent and transplant them as needed.
as for you wanting to cram pack your tent...i see how you would think that, but when you start adding more plants, you start crossing over into the SOG technique, rather than SCROG, even if there is a SCreen. remember, the point of scrogging is to utilize your entire canopy by using the screen to keep you plant opened up, and thus maximizing the amount of colas.
Hit me up if \you got anymore questions man, I am making a run of my first scrog as we speak, and i have done TONS of homework.
been vegging this Grape God for aprx. 7-8 weeks now, and I JUST flipped her today. Since this is my first scrog, I really dont know exactly what to expect, but judging from pics I have looked at from other growers, I think i am on point, and should be able to count on a hefty yeild. In the past I have always used LST as my main technique. Prety much the same concept, except I dont have to tie down EVERY new shoot with twist ties. That is why there are screws hanging out the side of my pot. I would just tie them down to the screws, and I had pretty good success using that method, but I kept seeing SCROG grows that were Just amazing, and the scrog grows were producing no larf bud, just all top shelf buds. The way i used to grow, I would get amazing yeilds. my last one was aprx 7 zips, but the difference is mine had about 3 oz of popcorn buds. This will be excluded when scrogging, so thats why I decided to give it a go. I have been growing for 3+ years, and kept putting off trying the scrog method for whatever reason, but now Its off and running.
Anyway, got off track some there. Hope that helps.
good luck and happy growing.
GTM
