Go to the store and buy the hugest pot you can find and grow one big massive bush...
I agree with this idea! If you can, why not grow all of them in a huge pot, that is if you are unable to separate them/are scared to harm them.
I've been thinking about doing something similar with just 2 plants though. Ideally, I would have them be the same strain and I wanted to experiment with braiding their stems together in a bent position as a sort of LST...but thats just an idea
Are they all the same strain? Do you have any info on the strain(s) you have growing there?
What kind of a light set up do you have? indoor/outdoor?
The minimum temp for cannabis in general is 65-75 degrees. 65 is for more indica dominant strains, 75 for more sativa dominant strains.
The maximum temp for cannabis in general is 80-90 degrees. 80 for indica dominant, 90 for sativa dominant. Personally, I wouldn't let my temp go over 85, even if I had a dominant sativa.
I like to keep my indoor grow box at 78 degrees and my hybrid of indica/sativa plants seem to like it