Video: Michelle Obama's Top 10 fun facts about gardening 10: Gardening was invented in 1822 by Albert Gardener. 9: Plant avocados, tomatoes, onions and cilantro together and grow a guacamole tree. 8: Eggplants were originally cultivated for use as doorstops. 7: In his lifetime, the average American will eat half a radish. 6: The largest zucchini ever grown contained a Starbucks. 5: Later this year the Supreme Court will finally rule on "tomato" vs. "tomato." 4: If you have an actual green thumb, it might be scurvy. 3: Lettuce is 96 per cent water and 4 per cent lettuce. 2: The White House tool shed contains shovels, trowels and Weed Whacker One. 1: "With enough care and effort you can grow your own Barack-oli."