Unsuitable location
Oleander loves you warm place in the sunwhich, however, should also be protected from the wind. The Mediterranean plant does not tolerate wind, it turns yellow. A change of location is also problematic, for example when moving from winter to summer quarters. This should always be done carefully and in stages so that the plant can get used to it.
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Nutritional deficiency
If a large number of leaves turn yellow in a short period of time, this can indicate a lack of nutrients. The oleander is one of the strong eaters and must therefore - especially if it is cultivated in the bucket - fertilized regularly will. In the case of insufficient fertilization, the yellow leaves are an indication of a deficiency, often of nitrogen and / or potassium. Fertilize Do oleander at least once or even twice a week with a good one during the growing season Flowering plant fertilizer.(€ 10.86 at Amazon *)
Lack of water
In its natural habitat, the oleander likes to grow on river banks that are flooded from time to time. So the plant is used to having wet feet frequently. oleander needs a lot of water and is one of the few species that can even tolerate waterlogging. If there is a lack of water, the leaves can turn yellow and are eventually thrown off.
Warm wintering
Another common cause of the yellow leaves of the oleander can be overwintering that is too warm, for example if you put the plant in a warm living room during the cold months. In winter, the evergreen oleander needs a rest, so you should bring it to one cool, but frost-free and bright place place. The winter lack of light can also cause yellow leaves.
Tips
If other causes are not possible, check the size of the bucket. Choose the tub size as large as possible, as the roots of the oleander will take up space. In addition, the plant should be repotted once a year.