I have a very large Gardenia plant that I keep indoors during the fall and winter. It is beautiful and healthy. It is loaded with buds right now. My question is that most of the buds have a white crystal substance on them. It doesn’t seem to be bothering the plant nearly as much as it bothers me. What is this and do I need to take action?
This sounds like it is Mealybug.
These links will help you.