1If your potting soil gets White Stuff? Why Mold on My Houseplant Soil and How Do I Fix It? white mold in soil is good or bad? What you need to do then? Here you will learn how to get rid of White Fuzzy and Moldy.. White, fuzzy growths can appear at the base of your plant seemingly overnight. Salvage your houseplant and prevent moldy soil in the future. You might find mold on houseplant soil after bringing your plants in for the winter, or it might grow in containers that are inside year-round. It can pop up on new additions to your urban garden, or it can appear on established members of your leafy collection. Mold occurs on soil for a number of reasons. Understanding what caused the problem and how to get rid of it will keep your garden and home happy.