This is the traditional, single-stem giant Russian sunflower that grows to at least five feet in height, but often much higher. The blooms are typically over a foot wide and packed with grey striped seeds that make a tasty snack for birds and people.
Harvest sunflower bouquets in early morning or late afternoon hours. Pollinator-friendly!
Start indoors four to six weeks before the last frost. Provide 70–75ºF soil temperature. Using peat, cow, or paper pots can help with the stress of transplanting; they grow delicate roots and successful transplanting may be challenging. Transplant after the last frost, 18–24 inches apart. Water seedlings regularly until established.
If direct sowing in the garden, wait until all danger of frost passes and soil temperature is over 70ºF. Sow a few seeds every 18–24 inches. Thin to the most robust seedling.
Cut stalks about a foot below the heads when outer seeds are mature (flower heads will become droopy, all of the petals will fall off, and seeds will harden). Hang flower heads upside down in a warm, dry place that is well-ventilated and protected from rodents and insects. Cover sunflower heads with brown paper bags, fine netting, mesh, perforated plastic bags, or cheesecloth. Use a twist tie or rubber band to secure the bag so the seeds don’t fall out.
When seeds are thoroughly dry (after a few weeks), dislodge them by rubbing two heads together, rubbing the seeds with your hand, or using a stiff brush over a big bucket. Allow seeds to dry overnight on a paper towel, then store in a cool, dry place for up to two years.