The white stuff in your soil is probably fungus that has started growing due to its high organic content and warm and humid environment. White fungus balls can be different shapes and sizes, depending on the type of fungi. In most cases, they are not harmful. In fact, if you keep them on the soil, they will start growing into small yellow mushrooms. However, it is advisable to get rid of it. The most dangerous thing would be white eggs, which are actually insect eggs that will develop into larvae and destroy your plant’s roots. Get a magnifying glass and carefully examine the white stuff in your soil.