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Giant sunflowers, known for their impressive size and vibrant appearance, can reach heights of 10 to 15 feet (3 to 4.5 meters) or more. Their large, bright yellow flowers can measure up to 1 foot (30 cm) in diameter and are composed of numerous petals radiating around a central disk. These sunflowers are often cultivated for their seeds, which are not only edible but also attract birds and wildlife. They thrive in sunny locations with well-drained soil and are a popular choice for adding height and visual impact to gardens and landscapes.