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They grow best in warm, humid, well-lit conditions, but they never do well in direct sunlight. This plant prefers light shade and dappled light indoors. Direct sunlight will burn the leaves and cause it to lose its vibrant colours. However, you should not put your Calathea on a dark spot either.
Watering is crucial for a success with Calathea plants. These plants require moist soil at all times. However, the plant should never be wet and it should never sit in water. It means that you have to be very careful with the watering regime and the amount of water you provide. It is best to give your Calathea small but regular amount of water during the growing season. Water as soon as you notice the surface starting to dry up. During the cooler and darker winter months you may water a little less.
Calathea plants benefit from occasional light feeding during summer months to improve their foliage production and overall vigor. Cut the fertilizer in winter completely. Water the plant deeply before feeding to prevent root burn. Let the soil absorb the water before feeding and make sure the surface is still moist before applying the fertilizer. It is best to fertilize it every 2 weeks using a half-strength houseplant fertilizer. Avoid any shine products, particularly those that have fertilizer included.
This problem would be a classic case of low humidity. These plants demand warm and humid conditions pretty much constantly, if you don't provide this then the leaves will quickly become tatty looking. Cut off the brown bits and improve its treatment going forward.
The soil needs to be kept moist for the majority of the time during the summer season. The only time it will forgive you for this is during the winter when it has stopped growing, if you let the soil dry out at any other time of the year these type of symptoms will appear
This could be a sign of overwatering, although it's more likely a sign of the temperature being too cold or from exposure to draughts. The damage will not be reversible if this is prolonged, move to a warmer spot or away from the cold draught immediately if you ever notice this happening.