Once a sunflower head opens, the clock starts ticking. A single flower head usually stays in its "prime" for about
Most sunflowers bloom in — typically from July through September in the Northern Hemisphere. However, exact timing depends on the variety, planting date, and climate. when sunflowers bloom
You’ll see the yellow or mahogany tips of the petals beginning to poke through the green sepals. When to Visit a Sunflower Field Once a sunflower head opens, the clock starts ticking