Helianthus tuberosum, the variety is named “Stampede”, the destroyer of worlds. Beware…once you drop these tubers into the ground, you will be able to take them out of the ground forever. You will never stop them. Nothing you could do would remove them, lest you own a bulldozer. And even then, they may still survive. An incredibly nutritious food if harvested and eaten late in the winter to dull the effects of the inulin digestion.