Hydrangea Plants
Q.

hydrangea leaves are turning brown/black and curling

Zone 4 | pmcintosh added on June 3, 2012 | Answered

These two plants have no blooms on them. They start out great looking then get the chewed leaf look.

A.
A.Answers to this queston: Add Answer
Nikki
Certified GKH Gardening Expert
Answered on June 4, 2012

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

Also, sooty mold is caused by pests, so look for them as well. Fortunately, there is an organic solution that treats this fungus (and the peststhat cause it). Treat the affected with neem oil once a week for amonth. Here is more information on neem oil: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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