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I knew an old time gardener who would not plant a seed potato with as he planted it he would cut a piece off to make sure it rotted and used all it's energy , he did not like to find anything left when he lifted. I cut some of mine as I plant, if I want to fill the row up. We did have a member who use to buy a single seed potatoe of a brand new variety and then cut every eye out and grow them as single plants, he once staged 20 plates of 5 potatoes each being a different variety.