Your smallest grow

I was wondering what all you stealth and space limited growers have managed to grow in. What size was your growbox or space and what was your final result?

Im currently working on 4 Blueberry plants, the space is in a realllllly dense pine forrest, with lots of short trees but there is an opening about 10 by 10ft my biggest plant is around 2ft the others are around 8inches