Food is the only product line that is not named among the four ruin types — weapons bring inspections, chemicals bring addiction, water brings liability and contraband brings raids. That is the whole reason the Farmer ranks in S tier: the safety comes from the product line, not from the station.
On this page
Probably Stolen hydroponic farmer guide: why food is safe
Hydroponics is a food production chain designed to be learned rather than a high-risk grey-market play. You are still exposed to rent, thieves and Augs; the difference is that none of those is caused by what you sell.
Outside the four ruin types
The Farmer is not among the four ruin types.
Supplies the rest of the economy
Food production feeds the parts of the economy the other professions depend on.
Protects attractiveness
Food keeps attractiveness from being wounded by empty shelves.
Where the food has to end up
Once production is running, the crop feeds three places at once:
The display case.
Food or berries draw food buyers and the restocking sellers who keep you supplied.
The grocery shelf.
It still needs food even when the case carries something else.
The restocking sellers.
That is the mechanism that makes food a repeatable rather than a one-off margin.
That is why the display case guide pairs bait with food shelves: an empty shelf still costs attractiveness even when the case is perfectly staged.
Running it overnight
Mechanically the Farmer feeds hydroponics bays overnight, which means the same power and energy-cell constraint as every other overnight chain. The rule is the same everywhere in this game: run one chain you can actually feed rather than three you cannot.
The production chains page shows what the farming chain yields and how it sits beside the furnace, the fermenter and the purifiers.
When to stop expanding
A late-game hydroponic bay is an expansion you should decline once you are close to the buyout. Banked cash beats a larger crop when the shop is weeks from being yours.