I'm in zone 3/4 and I typically start my zinnias indoors when I do my tomatoes - end of April. Zinnia's do well here but can be subject to powdery mildew as others have stated. California Giants and Purple Prince my favorite varieties.
This photo is of my cuttings for the farmers market. The pink and yellow flowers are a variety of seed that was given to me called cactus zinnia. They're not my favorite but certainly unique!
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