Have the PCs be taught the Ruth Stout method of gardening, it partially mitigates some of the main issues that complete newcomers to farming would have to deal with - it's not so labour intensive, it doesn't need as much water, it doesn't need weeding. But it is not without it's own negatives, it requires nitrogen which can, however, be conveniently supplied by fresh grass.
Much better detail here: -
https://www.bigblogofgardening.com/g...-stout-method/
And as an example of how effective it can be, how does 337 pounds of potatoes sound? Details in the following video: -
https://www.youtube.com/watch?v=GlratwBT5OI
The YouTube channel where that video is from is definitely worth browsing, they explore some questions we typically don't think of, such as, can you eat grass, how to make a root cellar out of an old chest freezer and so on.