www.eden-plants.com Ingo Breuer, Heinsberg / Oberbruch, Germany www.succulenta-kwekerij.nl Cok en Ine Grootscholten, Honselersdijk, Holand www.haworthia.com David Martin, Broomfield, USA www.alshaworthia.com AlsHaworthia, Francoise and Christian Prud’hon, France www.haworthia-gasteria.com Jakub Jilemicky, The Czech Republic - Praha www.cactus.cz Bohemia Cactus - the largest Czech web for literature on succulent topic