Multiple choice general knowledge sports World's biggest flower Sun Flower Ruffalatia Arnoldi Ulfia Daffodil Reveal answer Fill a bubble to check yourself B Correct answer Explanation Rafflesia arnoldii is the world's largest flower, native to Indonesia's rainforests. It can grow up to 3 feet in diameter and weighs up to 11 kilograms. Sunflowers are large but much smaller, while tulips and daffodils are common garden flowers.