If brown spots appear on the leaves of the hydrangea, there are three possible reasons for this. In addition to pests and an infestation by fungi, care errors can also be the trigger.
Brown leaves can be a sign of poor care or pests
Sucking Plant Pests
If your hydrangea initially gets yellowish and later brown colored leaves, the plant is often infested with spider mites. The tiny harmful insects are only about half a millimeter in size and can therefore hardly be seen with the naked eye. As a result, the infestation is usually only discovered when the extremely fine webs become visible.
remedy
Spray the plant with insecticides containing rapeseed oil and make sure that the undersides of the leaves are also thoroughly wetted.
Brown leaves from fungus
You can recognize leaf spot fungi by the brown spots on the middle of the leaf. The leaf tissue is initially thin and then tears open in the affected areas.
remedy
Remove all diseased parts of the plant and dispose of them in the household waste. The infected leaves must never be placed in the compost as the fungi will survive there. When applying the valuable fertilizer, you would unintentionally spread the spores in the garden and promote a new infection. If the infestation is severe, spray the hydrangea with a suitable fungicide.
care mistakes
The hydrangea is one of the very thirsty plants. It reacts very sensitively to a lack of water, which is noticeable in the early stages by hanging flowers and leaves. If the plant is not watered enough, the leaves will dry up and turn brown.
Too much fertilizer can also lead to brownish discoloration of the leaves. The foliage of an over-fertilized hydrangea dries up from the edge and is subsequently shed.
tips and tricks
Hydrangea pots offered in early spring are almost always grown in the greenhouse and flowered prematurely. This makes the plants prone to change and will often develop brown leaves once they are transplanted outdoors. Therefore, slowly get these hydrangeas used to the change of location.