Yellow Violet Passion Flower Seeds for Planting Compact Growth, Heir Earthechoseeds White Succulent and Cactus Ceramic Trough Plant Pot Selections Know all About Echeveria Succulent FNP I need help. What is that yellow stuff growing on my donkey's tail (I think that's what it is) and how do I save it? The backstory: I bought it from a Black Aeonium Zwartkop succulent plant turning green in winter due to lack of sunlight Stock Photo Alamy How to Grow and Care for Coral Cactus