I've checked one of the borderline castles in my counrty, Khuzaits. Prosperity is +1 due to loyalty and -8 due to food shortage, resulting in -7 total. But guess what? Food is +5 because of the lands around the castle, -2 due to the garrison it needs to feed aaaaaaaand... DAMN -11 because of PROSPERITY. It's basically an endless loop where the castle doesn't have enough food because prosperity is falling and it's falling because of food shortage. That should be fixed ASAP, low garrisons is one of the reasons why factions are snowballing. Also I'd like to have an option to donate supplies to the castle (I can just sell them in cities, but castles don't have a trade option) if I want it to be prepared for a siege.
