This happened only with her white potatoes, which grew from certified seed potatoes from her regular garden supplier. The disorder affecting the tubers is appropriately termed “hollow heart,” in which the centers of the tuber develop internal gaps. Hollow heart has likely been around as long as potatoes themselves have been around. Tubers with hollow heart are perfectly fine to eat after cutting away discolored parts. Hollow heart often shortens the storage life of potatoes, and the hollow space is often a spot where secondary storage-type rots can begin.