Can you tell me how the expression “green thumb” originated?
According to James Underwood Crockett, it comes from the fact that algae growing on the outside of earthenware pots will stain a person’s thumb (and fingers) if he or she handles enough pots. Hence, a person who is always working with flowerpots has a green thumb. Another theory is that it originated during the reign of King Edward I of England. He was fond of green peas and kept half a dozen serfs shelling them during the season. The serf who had the greenest thumb won a prize.