- You Will Get 115 Seeds Of Zinnia, Cactus Giant Zinnia Flower Seeds. - Annual. - Mix of colors. - 2 to 3 feet tall. - Full Sun. - These Giant Cactus zinnias are incredibly easy to grow and just beautiful. You'll be amazed at how huge the blooms are. I've had these grow up to 5 inches across.....as big as some dinnerplate dahlias!!! They bloom in a bright variety of colors from red, orange, and pink, to yellow. - Customers said that these grew to 5 1/2 feet tall! Incredible, and in actually not-so-great soil. - Plants will bloom until frost. - These have especially long stems and are perfect for cut flowers and bouquets. - Attracts butterflies! Comes with planting instructions.