Have a Hibiscus plant outside that has been great and producing good orange flowers until recently. Fertilize it monthly with Miracle Grow. Noticed a white power substance on flowers and branches. Flowers are small. Blasted off white power with hose. Flowers look better but white powder re-occurs. What is white powder? And what should I do?
White Powder on Hibiscus Branches
Certified GKH Gardening Expert
The white powder you mention sounds like powdery mildew. Neem oil can help with this fungal issue. Here are some articles that you may find helpful: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm