At the top of the list is farming, a new type of prison labour. You can grow potatoes, wheat, apples, and other crops, and either use these as raw materials in your kitchens or sell them as exports. There are new rooms to accommodate the agricultural activity: orchards, fields, and vegetable plots outdoors, as well as pantries and sheds for storage.
Prisoners can work on your farming plots, and those who have a green thumb can grow flowers as a pastime – this will help improve their mood and give them positive recreation time. But you’ll have to watch out, since not everyone is in it purely for the love of nature: access to gardening means some enterprising inmates will find ways to brew booze, while others will stake out garden plots as gang turf.