I think if you are trying to grow “trees” a 5 gal will get you there. The biggest things to consider is how often you have to water and is there enough nutrients? If you mix nutes daily and water as needed 5 gal should work. You will just need to fill your plant battery back up more often.

if you want to keep it shorter start training them if you want vertical growth without training start topping , I’ve taken hedge trimmers and topped a foot off of mother plants before they come right back no problems… Not sure what country you’re in but if you’re in the US or it’s latitude I wouldn’t advise the latter those will be buds soon enough

I would say make sure to defoliate before it gets too cold out so you can hopefully avoid bud rot and watch for rabbits (they love to chew through the stems and break them and eat the leaves) also I definitely spray for bugs until the buds start building. I’m using nuke ‘em flying squirrel and it’s controlled the bugs fairly well so…

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I’m using need oil every Friday. I also have marigolds and rosemary in the garden and a separate, non treated, tomato plant as a sacrifice plant. I also have a pit bull for security who eats anything that’s not supposed to be back there.

Neem oil

Scan your buds for caterpillars. They curl up and look just like little bracts. If you see what looks like bud rot it can be those little fuckers munching your flowers from inside a bud. BT early can help and so can bug netting.