Single leaf has brown leaf tips or brown leaves
If your single leaf shows brown leaf tips or even completely brown leaves, it is usually the much too dry room air that is to blame. In winter, in particular, when the windows are only opened briefly and the heating is constantly on, it is often too dry for the tropical plant. Ensure a higher level of humidity by spraying the leaf regularly and briefly ventilating it several times a day. In summer it is of course an advantage if the windows are open all day. Incidentally, brown leaf tips are sometimes also associated with an infestation by the red spider or by spider mites, which primarily prefer dry air and high temperatures.
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Single leaf has brown spots or spots on the leaves
However, if the single leaf has rather brown spots on the leaves, this often indicates over-fertilization. In this case, repot the plant in fresh substrate and fertilize less often. For a sufficient supply of nutrients, it is sufficient to fertilize with liquid complete fertilizer every two weeks - but only during the growing season, because the single leaf also needs a break during winter.
Furthermore, brown leaves are often an indication of a location that is too sunny - if you place the plant in the (light) shade, it will feel more comfortable.