Inconsistent Watering—Especially Underwatering
Sunflowers love moisture during the establishment and budding phases, but their drought tolerance later can lure us into neglect. I once assumed sunflowers would fend for themselves in a dry July and returned to drooping heads that looked more dead than daisy! Underwatering leads to small blooms and weakened stalks that snap in the wind.
Aim for a deep watering once or twice a week rather than light daily sprinkles—this encourages roots to dive deep. A layer of organic mulch around the base helps conserve moisture and regulate soil temperature. As the seed heads mature, you can ease back, allowing sunnies to tap into their natural hardiness.