Calathea plant may experience the problem of brown edges of leaves, curling, or yellowing. Brown margins normally signify low humidity or bad water quality whereas curling leaves imply underwatering or heat stress. Leaves turning yellow can be a consequence of excessive watering. To rectify such issues, water frequently, keep humidity high and use filtered water. Maintain the plant at constant temperatures and do not expose it to the sun. Periodically inspect to identify pests such as spider mites and treat them at the earliest stage to avoid damage and guarantee the well-being of the plants.