The Giant in Giant Double refers to the size of the flowers, which can be 4--5 inches across. You will generally find these in a mix of colors, all with dahlia-like blossoms. The plants grow to about 2 feet tall and will benefit from both pinching and deadheading. This is an older series of zinnia and can be prone to powdery mildew

• Tips for Growing Zinnias
• Top Choices for Cut Flowers
• Consider a Cutting Garden

• Perennial Plants for a Cutting Garden
• Selecting and Caring for Cut Flowers