What is this white stuff and how do I get rid of it.
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It is white fly, use a systemic instecticide. They are the most prevalent insect that attacks gardenia. Not sure where you are but could use a dormant oil a couple times during the winter then use the systemic in the spring.
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They don’t appear to have wings like whitefly. My bet is they are woolly aphids. Best treatment to get through their waxy skin is insecticidal soap or neem oil.
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Looks like scale, a insect closely related to aphids and whiteflies so you could get rid of them the same way
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