Sunflower seeds

Sunflower seeds are technically the fruits of the sunflower plant (Helianthus annuus) ( 1 ). The seeds are harvested from the plant’s large flower heads, which can measure more than 12 inches (30.5 cm) in diameter. A single sunflower head may contain up to 2,000 seeds ( 2 ). There are two main types of sunflower crops.