MrStinkyanswered grow question 3 years ago Well, I just did 2 plants in a 2x2 in 11L pots.
No problems at all, although you will need to LST to keep their canopies contained, dont let them tangle and block the light from each other. Scrog net might be beneficial if you absolutely want to stick another plant in there.
I am considering a 4-5gal pot and 1 plant at a time though to see how the results differ 😅
What ever you decide, make sure it works for you.