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Remove dead or heavily spotted leaves and discard them.

2. Hydrangea Leaves Turning Yellow. During the growing season (the spring or the summer) if hydrangea leaves unexpectedly turn yellow and then brown and begin to fall off, a problem with the roots is usually the cause. Nov 25, Even the most magnificent hydrangea bush loses its leaves as cold temperatures signal winter's approach. Hydrangea are deciduous shrubs, meaning they appear to die in fall.

Hydrangea are also. Mar 29, They pierce the leaves and remove fluid from the leaves leaving tiny yellow spots behind. If you see spider mites you want to spray water on them to knock them off your hydrangea leaves.

Aphids and whiteflies do a similar thing by removing sap from the hydrangea tissue which causes the leaves to turn yellow, curl up, and fall off bushfelling.buzzted Reading Time: 4 mins. Aug 26, Treating Hydrangea Leaf Spot. Treating already damaged leaves that are going to fall off is not the solution to avoiding leaf spot next year.

Practice good sanitation by disposing of all damaged leaves as they fall. In spring, avoid overhead watering, if possible. The water can splash the fungus from leaf to leaf and onto other plants bushfelling.buzzted Reading Time: 3 mins. Jul 08, It begins as brown or purple spots on the leaves at or near the base of the plant. The circular spots are often small and scattered and usually measure 1/8 to 1/4 inches in diameter.

Spots on the bigleaf hydrangea develop tan or gray centers surrounded by brown or purple halos. Leaves may eventually turn yellow-green and fall off.