What unique characteristic do sunflower plants have?

Sunflower plants are known for their unique ability to exhibit a behavior called heliotropism, where young sunflowers will turn their blooms to follow the sun across the sky throughout the day. This characteristic enables the plants to maximize their exposure to sunlight, which is crucial for their growth and energy production through photosynthesis. This movement is typically observed in young plants, allowing them to optimize their light intake as they develop.

In contrast, sunflowers are typically not perennial; they are usually classified as annual plants, meaning they complete their life cycle in one growing season. Additionally, while sunflowers can tolerate a range of climates, they generally thrive best in areas with full sun and reasonably moist soil rather than specifically dry climates. The seeds of sunflowers are relatively large and are known for their nutritional value, contrary to the impression that they are exceptionally small.