Zinnia angustifolia (Creeping Zinnia): 'This type of zinnia is great for ground cover,' says Tony. 'Since they feature smaller, single-petal flowers.' Additionally, Carrie tells us that this ...

These annual flowers need to be replanted every spring, and knowing when to plant zinnia seeds—either indoors or out in the garden—is your key to success. This step-by-step guide on how and ...