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If you need a long-blooming zinnia to mix with other warm colors, consider ‘Zahara Double Fire’:
The plants grow 15 to 18 inches tall in full to part sun and they’ll keep blooming all summer long.
This cultivar won both an All-American Selections award (AAS) as well as a European Fleuroselect award for its superior garden performance.
I start my zinnia seeds indoors about 5 to 6 weeks before my frost date for an early start to the growing season.