One of the most popular pumpkins in the world, and the one that wins most non-pumpkin eaters over, ‘Waltham Butternut’ is originally from Waltham Massachusetts in the USA where it was developed by Charles Leggett and grown in the Waltham Field Station in the 1940s. The flesh was described as smooth as butter and sweet as a nut. Few could disagree and they are undeniably one of the most popular culinary pumpkins in the world today.