When caring for Calatheas, think tropical, warm humid conditions. They’re used to only dappled light making its way down through to the rainforest floor. For that reason these plants prefer bright, indirect light. Sit back from a south facing window. Too much sun can cause the leaves to lose their stunning colours.
When it comes to watering keep the soil slightly damp. Allow water to drain from the inner pot before inserting back into the decorative pot. This ensures the plant will not be sat in water, as this can cause root rot.
They absolutely love humidity. Mist regularly or use a humidifier.
Repot every 2 years or when the Calathea has outgrown its pot. Only go up one or two pot sizes using a well draining soil.
Problems
Edges of the plant turning brown and crispy - Lack of humidity.
Leaves turning yellow and falling off - Possible overwatering; root rot.
Leaves turning brown - Underwatering
Losing colour - Too much sunlight