Can you tell me how the expression "green thumb"...

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Question: Can you tell me how the expression “green thumb” originated?

Answer: 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.