Years ago when I lived in the city I lived for awhile next to an old lady who years earlier would plant huge gardens over her whole property. Now in her 80s she would just go in early summer and poke some seeds in the ground. She wasn’t digging anything, only enough to stick a seed or two into the ground. Hers was about the only place I observed someone growing tomatoes on the ground. I think she would put some paper under them when they got big just to keep them off the dirt. When she moved out and I bought her house there were still some tomato plants growing kind of wild in her yard.