I keep getting black spots on my hydrangea, which makes the leaves yellow and then they fall off. My flowers never bloom. I have tried several professional solutions to no avail. Will the baking soda, water and dish soap do the trick? My other hydrangea so far is OK.
Black Spot on Hydrangea
Certified GKH Gardening Expert
It could be either black spot or sooty mold. Both are treatable and in most cases, not fatal to the plants. These articles will help:
(this is about black spot on roses, but it applies to all plants) https://www.gardeningknowhow.com/ornamental/flowers/roses/black-spot-roses.htm
I read that Hydrangeas get black spots because of too much hot sun. I have the same problem and plan to move mine in the fall to an area where they get morning sun and afternoon shade. It's just too hot and even the Pee Gee Hydrangeas, which like all day sun, are loosing leaves.