Purple Coneflower -- http://www.gpnc.org/purple.htm
Overview of the characteristics of Echinacea purpurea and several related species as wildflowers, with photos and basic information.
Dave's Garden: Eastern Purple Coneflower -- http://davesgarden.com/pf/go/26/
Includes basic information, photographs, and user submitted comments.
Flower and Garden Magazine: Simple Pleasures: Discover the Versatility of Purple Coneflower -- http://www.findarticles.com/p/articles/mi_m1082/is_n4_v42/ai_20912188
Cultivation and lore.
Production of Purple Coneflower as a Cut Flower -- http://www.agnr.umd.edu/mce/publications/publication.cfm?id=65
Includes cultivars, propogation, insects and diseases.
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