60 - 80 days. Zinnia elegans. Annual. State Fair Mix Zinnia seeds grow some of the tallest and brightest Zinnias growing this summer. State Fair Mix Zinnia seeds deliver brilliant 5-6" full double dahlia-like blooms from June up until the killing frost. State Fair Zinnia Flower Mix is easy to grow from seeds and boasts a higher resistance to disease and powdery mildew than other zinnia favorites. These Zinnias Flower Seeds are one of the best tall varieties around.