Depends what you're growing in and your skills as a grower. I can grow trees in 3 gallon pots. I guess some of you guys would call me an old school grower but I don't need to learn any new tricks. Too many people and all these new tricks having nothing but issues with their grows even though they have the newest lights, fanciest dozen bottles of nutes and half a dozen other products. Money thrown left and right and still crappy grows.
I treat cannabis like the plant it is. There are no new tricks. There are just new cannabis specific products that you don't need to have excellent harvests. It's just a damn plant. What new tricks are you referring to? I find it's much harder to teach the younger growers that they don't need all the over hyped, massively marketed with false claims and broscience cannabis specific products.
1.5 liter 6 ft tall plant