Classic Sunflower pillow printed on White Linen Hidden zipper in back Knife edge finish 20" x 20" Feather down fill At the bud stage, sunflowers have an unusual trait called heliotropism. It is when the bud of the sunflower faces the sun at all times during the day starting the day facing east and and ending it facing west. The sunflower can grow up to 18 feet and the tallest recorded was 25 feet in the Netherlands in 1986. A single sunflower can have up to 2000 seeds and the largest sunflower head grown was in Canada measuring 32 1/2 inches.