I know that peah applies to fields of food crops (not other produce) and that halacha is to leave at least 1/60 of the field unharvested for this purpose.
What I haven't found is whether there is a minimum field size for the halacha to apply at all. I think the torah had in mind things like wheat fields, but what about a household vegetable garden? Do we assume that the poor would come and collect 1/60 of even a small field, even if that turns out to be three tomatoes? Is there a size below which we say the requirement does not apply, either for practicality or for some other reason? (On "some other reason": I know that a very small room doesn't get a mezuzah, so the concept of a minimum size might apply to other mitzvot too.)
I know there are different opinions about where/whether peah applies today. I'm not asking about that. I'm asking: if peah applies, does it apply to even small fields, or is there a size threshold?