[WallShadow]

On the topic of seeds, I could see where high-yield hybrids might seem desirable, but on the long-view side, heritage species would be more likely to be more renewable after the first couple of growing seasons/generations.

Again, depending on the state of civilization/population base in the team's area of operation, focusing on intensive rotated integrated-crop farmsteading, including a family pig and/or goat/sheep/cow if available, might provide the simplest, most defensible food production arrangement. Especially if you have nearby neighbors who are willing to come to help you if raiders are attacking, as long as it's understood you'll return the favor. There might be a common central field for grain production, with the farmsteads on the perimeter. This would help build a sense of community and civic duty, if the current civilization is one radish away from collapsing into anarchy and starvation.