Society for amateur and professional growers of plants in the geraniaceae family, with an emphasis on pelargoniums. Overview of the society, its publications and events, classification, and affiliated organizations.
Fact sheet from the University of Nebraska extension covering classification, indoor and outdoor care, propagation, and pests. Diseases are covered extensively, with tables describing symptoms and control methods.
Article by North Carolina State University extension provides an overview of types and cultivars, indoor and outdoor culture, propagation notes, and disease problems.