Sunflowers are beloved as summer annuals. Learn more about the different varieties of sunflowers, how to care for them, and ...

During this time, the shell of the sunflower seed cracks open, and the seedling begins to develop roots. Vegetative stage: Sunflowers do most of their growth during the vegetative stage of their ...

sunflowers can grow several feet tall and have long tap roots. Plant each seed 6 inches apart and leave about 30 inches ...

The discovery that sunflower seeds can develop without fertilization reveals a pathway to accelerate improvement of this crop — and potentially others. When genetically different varieties of ...