In The Hostapedia, Mark Zilis describes every hosta that he has encountered over the past thirty years. This includes forms he studied in gardens and nurseries throughout the United States and those he observed in native habitats and collections in Japan. It encompasses all cultivars registered with the American Hosta Society and others listed in a wide variety of publications and websites. The 1900 photos in The Hostapedia highlight the most important hostas, as well as many unusual collector's plants and hosta oddities.