Form If you’ve noticed over the past few days that hydrangea leaves are turning black from the edges inward into the middle or even all the way through, and you’re not sure what’s causing it, let me give you the solution first by explaining that these plants are essentially shrubs with large flower heads, are simple to grow, and come in a wide range of varieties with various colors. Anybody could be the cause of the black leaf issue, for the reasons listed below.
Why are the leaves on my hydrangeas going black? The most frequent causes of black spots on hydrangea leaf include frost damage, temperature changes, excessive sun exposure, excessive fertilizer, nutrient deficiencies in the soil, and excessive water. In some situations, an insect or fungal infestation causes hydrangea leaves to turn black around the edges.
Before I move on to other things, let me just say that it might be a result of overwatering, as excessive watering can cause harm to the leaves, such as leaf spots, browning, or black coloring. Even a small amount of water can cause these flowers to become dry, which in turn causes the leaves to turn black or brown and drop off. That will happen gradually. If you are overwatering or underwatering, examine those first before moving on to other options.
If the problem can’t be solved by the first option, I’ll describe the answer from the most common cause to the final resort.
Table of Contents
1. Frost Damage
This Your plant may have been impacted by a temperature fluctuation if there was too much moisture on the leaves in the winter or the first few weeks of spring, which turns the edges of the hydrangea leaves black. Currently, due to climate change, some regions experience extreme heat while others experience subzero temperatures.
Covering the hydrangea with horticultural fleece, which is intended to shield plants from further frost damage, is the best approach to prevent frost damage. The blankets are portable and simple to use.
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2. Too Much Sunlight
You probably already know that hydrangeas may easily live in shadow to partial shade indirect sunlight and rarely require direct sunshine to bloom. The hydrangea leaves would turn black if you moved them or changed the setting to an area with lots of sunlight.
Too much sunlight will cause the leaves to burn from above; the burn essentially starts at the border of the leaf and gradually spreads to the entire leaf. The Leaves will appear to be a greenish-black hue. Simply move the site to a shaded area for a few days to determine if it works or not before moving on to the next solution.
3. Overwatering
Hydrangea plants prefer to have their soil moist, but don’t water them excessively since this can lead to drainage problems in the soil and root rot issues. Black patches, black leaves, brown leaf margins, and discolored, dry leaves are all encouraged by this.
If your hydrangea plant is overwatered and the black or brown leaf patches are the result, look for the signs. If this is not the problem, see the next response.
4. Too much Fertilizing
There are problems with overwatering, but what if your plant has received too much fertilizer? The issue is being caused by a higher or lower ratio or concentration of salt in the potting mix. When hydrangea leaves receive too much fertilizer, the edges of the leaves may burn, eventually turning the entire leaf black.
Check the soil and fix the condition that is causing it. A soil test is required to determine whether the soil is acidic or alkaline, as well as to ensure that your plant is not suffering from a magnesium or nitrogen deficiency.
Some people have great soil, but they might also have fungus or insect issues, therefore soil tests should only be performed if the other three treatments didn’t work or if you want to go on (most probably).
5. Insect Problem
Aphids are the insects that produce the honeydew-like liquid that sooty mold and another fungus like, which grows and collects on branches and hydrangea leaves, turning the majority of the leaves black. Aphids just consume the sap juice from the leaves, but as the leaf ages, it becomes covered and turns black.
Use insecticidal soap designed to get rid of these insect issues to address the aphid and sooty mold issues.
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Reference
http://www.ladybug.uconn.edu/FactSheets/hydrangea-diseasesand-pests.php