Plants need fertilizer only when they are actively growing. Slow growing plants in low lightWhen you select “Low Light” a list of the most adaptive plants in our database appears. These plants can live in lighting conditions too low to support any other plants in our database, but will grow faster in medium and high light. Variegation (color) in the leaves is often lost in low light. A plant in low light needs less water and fertilizer than the same plant in better light. Place a low-light plant within 2-3 ft. of a window with a northern exposure, 3-5 ft. of a window with an eastern exposure, 4-10 ft. of a window with a western exposure, and 10-18ft. of a window with a southern exposure. A low light area has between 50-150 ft. candles of light. The best low light house plants are: Chinese Evergreen, Dracaena Janet Craig, Peace Lily, Heart leaf Philodendron. 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.