Although the big, beautiful flowers of the hydrangea lend a certain merriness to the garden, the sudden appearance of purple leaves on these bushes may be enough to make a gardener cry. Purple spots on hydrangea leaves are a good indicator of cercospora leaf spot, a common leaf fungus in these plants.
Slow the spread of cercospora by cleaning up fallen leaves and watering your hydrangea at the base.
Hydrangea leaves that turn purple may be trying to tell you that there simply isn’t enough phosphorus nearby to keep the plant healthy.
Weather can also influence the color of hydrangea leaves, causing large areas of purple discoloration.

Read on if you own a hydrangea with purple leaves to learn about common causes of hydrangea leaves turning purple.
Plants are rarely killed, but spotted leaves may shed prematurely, weakening the plant and reducing viable buds. Opening the canopy by thinning up to a third of the branches inside a tightly packed hydrangea bush will increase air circulation, making it difficult for the spores to germinate.
Sometimes, in their rush to change their hydrangea’s flower colors, gardeners may accidentally cause the pH to drop so low that other chemical compounds bind phosphorus.
Cool weather near the end of the growing season may trigger the plant’s dormancy early, allowing the purple leaf color to show through as the green chlorophyll factories shut down for the season.

Pluck off the badly damaged leaves when they dry out, but leave those only partially injured behind until new leaves form.
The small purple to brown spots usually start near the base of the plant, spreading outward and upward as water splashes the spores to other leaves.
If cercospora is severe and widespread, azoxystrobin, chlorothalonil, mancozeb, myclobutanil or thiophanate-methyl should be applied at 14-day intervals.

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