Canning potatoes is definitely still around! For those who may question this all it takes is a walk down any canned vegetable aisle in the grocery store. There you will find canned potatoes in water in slices or cubed, as a convenient way to add spuds to your favorite soup or stew. As for letting an at-home batch sit overnight unrefrigerated? Not recommended. It’s always best to err on the side of caution and if you need to hold cut potatoes in water overnight prior to canning, it’s always a good idea to keep the temperature in the ‘safe’ refrigerated zone until ready to proceed.