Improper care and inappropriate growth conditions can cause various flower problems:
1. Drying of the tips of the foliage. If only the tips of the leaf dry, then this is due to excessively dry air. In this case, they begin to moisten the bush from the spray bottle more often, while the pot with it is placed on a pallet filled with wet pebbles.
2. Dry spots on the leaves. Most often they appear when spraying a bush, when too large drops of water remain on the foliage. When the sun's rays hit these droplets, it causes sunburn.
3. Drying foliage. This can happen due to drafts, overly poor watering, or when thrips settle on the flower.
4. Yellowing of foliage. If only the lower leaves of the calathea turn yellow, then there is no need to worry, because this is a completely natural process associated with the death of old leaves. If not only the lower leaves turn yellow, then this may be due to the fact that the bush is overfed with fertilizers or it is not watered correctly. Leaves can turn yellow both due to a lack of moisture and due to the fact that liquid stagnates regularly in the root system. It is necessary to moisten the substrate in the pot only when its top layer dries out to a depth of about 20 mm. Otherwise, the roots of the flower will not receive enough oxygen, and rot will appear on them, and the foliage will begin to actively yellow. You should also be careful about feeding calathea. Please note that a nutrient solution prepared from half of the manufacturer's recommended fertilizer dose should be applied to the soil (see instructions on the package). Yellowing of the foliage may also be due to the fact that the room is too cold.
5. Curling foliage. Drying and curling of foliage occurs due to excessively low temperature or humidity, and also due to the influence of drafts.