What are the reasons of the brown edges on some plants such as Ficus
Hawai and Maranta (prayer plant )
All of these plants (Ficus, Maranta and Calathea) usually develop brown leaf edges when the air is too dry. You need to increase the humidity around your Calathea Plant, Ficus Plant, and Prayer Plant by placing a small humidifier near them or setting them on a wet pebble tray. If using the wet pebble tray be sure the plants are sitting on the pebbles and not in the water. Another cause of brown leaf tips and edges is too much fertilizerPlants need fertilizer only when they are actively growing. Slow growing plants in low light require very little plant food. Too much fertilizer is worse than not enough. Most plants prefer a water soluble plant food at 1/2 the recommended strength. Plants that are in bloom or dormant should not be fertilized. Houseplant food contains nitrogen (N), phosphorus (P), and potassium (K). A fertilizer containing these elements in equal proportion is considered a balanced plant food. Nitrogen helps in photosynthesis and encourages the growth of leaves and stems. Potassium and phosphorus also help in photosynthesis and aid in root and flower development. Most fertilizers have trace elements of other minerals that are lacking in the soil but are necessary for good plant growth. Fertilizers have a high salt content. If a plant is not producing new leaves and doesn’t absorb the fertilizer, salts build up in the soil. These salts can burn the roots, discolor the leaves, and cause new growth to be small. or too much salt in the water. This, however, would affect all of your plants, not just the three you mentioned.