Nitrogen fixerr four small containers

Hi everyone,
So the problem I’m having is that I have some smaller about 3 1/2 gallon containers That I have some edible ornamentals in at my work office. I would love to find some small nitrogen fixing plants to put in there with them so as to use less fertilizer. does anyone have some suggestions?

If anyone is wondering it is super dwarf Cavendish banana and a pineapple plant

I am keen to see a solution to this issue.

Short peas may work.  Or you can try red or white clover.  

I will have to look into the short peas. The clover got a little bigger than I wanted. In an ideal world. I suppose I could always trim it but I think it would look a bit silly giving it a haircut with the office scissors :)