There is a lot of info out there that will tell you to cut a seed potato to maximize the eyes then let them dry for a few days. Supposedly drying will help keep diseases to a minimum. I grew up learning to cut a potato in half in a way that will maximize the eyes on both pieces then planting them, Worked great for the folks and has worked well for me.I meant you should cut them when you plant them. on the pic they look as if you cut them first then let them sprout. sorry if I got it wrong.