White dust on gardenias
I have a number of Gardenias in containers all doing well, only the odd yellow leaf from time to time but no problem. However, I have recently noticed what seems like a grey white dust on the leaves of one of my gardenia plants, possibly tiny mites, having reduced eyesight I cannot see for sure if they are tiny insects. If they are, what do you recommend to kill them? Thank you.
Certified GKH Gardening Expert
This sounds like powdery mildew. Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm