Greetings you made me remember once that on a construction land on the concrete roof of my house was born a bush of peppers and this always had one for me so I decided to plant other things among these black beans that a very important food in our daily diet, in summary, I was taking care of my garden on the roof and came to visit my house and mocked you'll have to bring a truck for the harvest hehehehe. I was calm and it turned out that this space of 1.5x.15 was 99% effective in 20 plants and I harvested 1/2kg of beans more than enough for a good meal.
Great things can be achieved through small things...Seems the same goes for beans! 😀