Pre-nuclear potatoes are the earliest generation of potatoes. These are grown from tissue culture in our greenhouses. As these have never been grown in native soil and they are free of disease. These marble sized tubers can produce high yields of up to 200% or more by weight. This beautiful, medium-sized, extra-late potato has deep blue skin as well as consistently blue flesh. This high yielding plant has beautiful blue flowers. The rich taste of these potatoes when mashed is enhanced by the color. To keep color, do not overcook. Once blue potatoes were grown on potato trial grounds between other varieties to demarcate the division between varieties (called purple marker).