Yes! You absolutely can grow sunflowers late in the summer as long as you have enough days left in the season before the first fall frost comes. Sunflowers are known as a late summer bloom however, they play a big role in the fall as well. You are sure to find plenty of sunflowers displaying their beautiful showy petals from August to November in landscapes as well as interior design.
Start planning now for your show-stopping fall decor, Thanksgiving centerpieces, and fresh flower bouquets. Some of my favorite fall decor combinations include the iconic sunflower, colorful corn varieties, pumpkins, oak leaves, and dried wheat bundles. Try your hand at a DIY floral arrangement with a harvest from your very own garden. Add a touch of brightness throughout your home as the daylight begins to shorten.
Growing Fall Harvest Sunflowers
Usually, sunflowers need 55-75 days to start blooming. If you live in hardiness zones 8 or higher you can plant in mid to late August. Below Zone 8 you can still see some good blooms if your plant as soon as possible up to early August. When starting seeds during the summer the most important thing to be aware of is how moist your soil is. Check on your seeds regularly and hand water for additional moisture when needed.
General Sunflower Growing Information
TLM Unique Sunflower Recommendation
Chocolate Cherry Sunflower
55-75 Days until Blooms form (dependent on chosen variety)
4-10 Days to Germination
Well-draining, nutrient-rich soil
Sow seeds ½” deep
Keep your soil moist
Thin After Sprouting
- Large Varieties - 1ft apart
- Small Varieties - 6-8 in apart
Early frost can stunt growth
- Height: 72 inches
- Bloom: 5-8 inches
- Days to Blooming: 65-75
- Ideal for gardens or as a cut flower