Echinacea is hardy to USDA zones 2a to 9b. The USDA lists Echinacea as an endangered species in Florida. Our east coast native, pink blooming Echinacea grows back for us every year in South Jersey as a carefree perennial.
Dave's Garden lists over one hundred cultivars (types) of Echinacea. Surely you can find a coneflower in a height and color perfect for your garden.
Clinical studies have been variable in their statistically significant results proving the effectiveness of Echinacea purpurea in preventing rhinovirus colds.
Cultivars of Echinacea Dave's Garden Plant Files
Echinacea University of Maryland Medical Center
Echinacea MedicinePlus, NIH
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