>>1315668You can do square foot in raised beds that are not much deeper than that and it works. I did with my mini garden.
>pic relatedThat's a 90x60x40cm with about 100l soil and a lot of filling material.
Smart pots or something like that are a great thing and I used to grow a lot in them in my "schrebergarten" till I turned all the beds into raised beds. I don't say the wheelbarrow pot is the smartest thing but it could work, at least with cherry tomatoes if you got a spare one.