Oleander blooms often fail in wet and cold summers
If the oleander has developed many beautiful buds, but these take time to emerge or are simply thrown off, it is the plant probably too cold for flowering and too wet. In order for them to bloom, oleanders need a lot of sun and warmth - and also the right kind of moisture, namely that from below. The Mediterranean plant, on the other hand, does not like rain at all - especially in connection with a lack of or insufficient heat. In such a case, the only thing that helps is to wait for better weather or to put the oleander in a bright and warm winter garden.
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Black, hard buds often indicate a fungal infection
Sometimes, however, it is not the weather that is the cause of the failing bloom. Black, hard buds, for example, are usually one Indication of a fungal infection, to which the oleander is unfortunately very susceptible. You can only prevent such an infection by spraying a pesticide in good time prevent, which is ideally done in autumn and before moving to winter quarters will. If the outbreak has already taken place, however, only one thing can help
Cut back into healthy wood.Be careful when applying pesticides: test first!
The oleander is particularly sensitive to some oil-based pesticides. Before use, carefully read the instructions for use and the instructions for use: Many packages already state which plants the product is not suitable for. For other products, first try a small area to see whether your oleander can actually tolerate this agent.
Tips
Before you finally move your oleander out of winter quarters, you can first move it to a warm room. However, you should install additional plant lamps for this, because the shrub needs a lot of light, especially for the formation of buds and flowers. Finally, move the grown oleander into the garden between the beginning and the middle of May.