I am growing sunflowers in my garden, and for a while they seemed to be thriving, but then the leaves started getting this white tinge to them. They are still alive but don't seem healthy. Do you know what this is?
Certified GKH Gardening Expert
It is likely powdery mildew. Neem oil can help. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
You can also find other home remedies for powdery mildew here: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm