Is it possible to get a pound from 1 marijuana plant in a 3x3 indoor grow tent
There’s a few that do it regularly in a 3x3.
. @imSICKkid has done it numerous times.
He’s not around much any more tho.
There’s a couple others as well just can’t recall who.
I will tell you that all their grow parameters are on point when they do tho.
If great lighting and managing the grow very well, yes.
Happy cake day! @Oldguy
Thank you kindly my friend. 
It is absolutely possible. I think I’ve read of somebody pulling like 22oz out of a 3x3. And happy cake day @Oldguy !
@Borderryan22 Thank you my friend.
With 400 watts of quality lighting, proper temperature and nutrients- easily get 1 lb in a 3X3 with a photo period plant. I have never heard of anybody getting a pound from an auto flower. I am not saying that is not possible with an auto, I have never heard of it.
I run 405 watts (3 HLG 135 panels with LM301b diodes) above my plants and get from 3/4 to 1 lb (from photoperiod plants.)
This was my goal when coming back to growing. I started with a small 2x2 and a 150 watt light. Realized pretty quickly needed more space and light. Bought a new 38x38x72" tent and HLG 350 Evo, increased my pot size for final transplant to 10 gallon and now I am getting 12 zips on average.
Just a few late flower pics from several grows once I got the bigger tent and great light
2 pounds. 1 gg4 super fimmed and trained wall to wall got me over 2.
It sure is possible, I do it on average of every 4 months
Happy Canniversary brother @Oldguy 
Thank you most kindly @spankyjr1
Appreciated Brother.
@Oldguy Happy Canniversary!!
You can pull a LB out of a 2x2 with the right plant and a 300 watt led bar fixture
Thanks Brother @Low . Appreciated.
I average about a pound between 3 plants in my 3x3
Nice buds