American Giant Sunflower is a classic annual that reaches impressive heights, earning its name through towering stems crowned with massive golden flower heads. Hardy across zones 2 through 11, this variety thrives in full sun and needs remarkably little water once established, making it both forgiving and rewarding for gardeners of any skill level. Direct sow seeds into warm soil in spring, and you'll have cutting-ready blooms and seed heads by midsummer. The gray and white striped seeds are particularly prized by gardeners who want to harvest edible seeds, while the long stems make exceptional cut flowers that keep producing side blooms when you deadhead the main head.
3
Full Sun
Low To Moderate
2-11
?in H x ?in W
—
High
Hover over chart points for details
The American Giant produces the kind of flower heads that stop traffic, with robust stems built to support substantial blooms without staking. Gardeners prize the gray and white striped seeds inside, which deliver excellent flavor for eating fresh or dried. Cut the main flower head and the plant rewards you by developing multiple side-shoot flowers, extending your harvest season well into late summer and fall.
American Giant Sunflower serves dual purposes in the garden. The massive flower heads are prized for cutting and bringing indoors, where they last impressively long with proper vase care. The mature seed heads are harvested for eating; the gray and white striped seeds are particularly flavorful, whether you roast them as a snack, salt them, or save them for the following year's planting.
No timeline data available yet for this variety.
Direct sow seeds into the garden as soon as soil warms to at least 55°F in spring. Press seeds into moist soil at the depth specified below and keep the seedbed consistently moist until germination occurs within 7 to 10 days. Germination temperatures range from 50 to 75°F.
For cut flowers, harvest in the morning just after the flower opens, using a clean knife. Place stems immediately in a clean vase with water and a few drops of chlorine bleach to keep the water fresh and extend vase life. For seed heads, wait until the protective bracts surrounding the head begin to shrivel, then cut the entire head and hang it upside down in a barn, shed, or dry, airy location. Once completely dry, rub the seeds off the head by hand. If you plan to eat the seeds, soak them overnight in one gallon of water before salting and drying.
Cut the mature central flower head with a clean knife once it opens fully; this pinching stimulates the plant to produce multiple side-shoot flowers, extending your blooming and harvesting period significantly. Removing the main head channels the plant's energy into lateral stems rather than trying to expand a single massive flower.
Enter your ZIP code to see a personalized growing calendar for this plant.