Open Access Research Paper Views (923) Different growing substrates affect Periwinkle’s (Catharanthus roseus L.) growth and flowering Ali Khanzadeh, Davood Naderi J. Biodiv. & Environ. Sci. 6(6), 179-186, June 2015. Keywords: Flower quality, Growing media, Periwinkle (Catharanthus roseus L.), Vegetative growth Details