Hydrangea

Question

Why are the leaves on my hydrangeas turning black? I recently transplanted a few potted hydrangea plants. They were the type you buy in a smaller pot as a gift. Some are in sunnier parts than others. I see new growth, but the color change in the leaves is really strange.

Answer 1

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
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm