Sunflowers are one of the most beautiful flowers in the world. Did you know that sunflowers can be used to clean up radioactive waste? Sunflowers are primarily grown in Kansas, Colorado and North Dakota. A sunflower only requires 90 to 100 days to grow and it can grow from 3 to 18 feet tall. A single sunflower can have up to 2,000 seeds. The sunflower actually tracks the sun’s position in the sky which is called heliotropism. The tallest sunflower was grown in the Netherlands in 1986 and it was 25 feet tall. Here are some Sunflower pictures.