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 Herbal Recipes: Pineapple Sage, Lavender, Basil, & Lemon Verbena eat breathe garden Split rock discoloration and caving in advice needed Beginner Urban Garden Seed KitEasy Grow Herbs & VegetablesLettuce, Carrots, Radishes, Basil, Cilantro, Beans, Tomatoes, Peppers, ChivesCompact