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This hempy I did was close to the 2lt size, just more shallow. I had no root problems that I could see. I keep thinking of how many I could get in a small space It means I'd have to figure out how to work nutrients better than just tossing it at the plants though, wouldn't it? Do you think it'd matter if the pots were shallow and wider rather than taller and slimmer?
Well... ya gotta be careful with the height issue.... and it's unique in a perlite only grow. Since I use just the super light perlite, I really need the depth a 2L gives me to hold the plant firmly. Adding verm to the mix will thicken it and hold the plant much better, but I still feel the 2L would be needed. Of course, one could try shallower containers and tie limbs to keep everything in place.
I feel you might be a bit gun-shy on the nutes. I start at 1/2tsp of DynaGro Grow and work my way up. Jump them up by 1/4tsp increments every 2 or 3 feedings until I see the plant growth I want or some minor first signs of burning. Add 1/2 tsp CalMag to every gallon of water I use... bing bang boom, harvest and smoke. As far as hydro nutrient regimes go, it's as KISS as I can make it.