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For single packets, click here The only variety to grow for giant sunflowers! At 10 to 14-in. across, the largest blooms on the tallest plants growing up to 16-ft., although the average is closer to 10 to 12-ft. Begin to take cuts in about 80 days after sowing. Sun: Full Sun Bloom Size:10 – 14Inches Stem Length: 18 – 24 Inches Height: 10 –16Feet Hardy Annual Catalog Page: 77