Most indoor plants will not require frequent fertilizing. A good application of fertilizer every two to three months should be sufficient for most indoor plants. Do not fertilize new plants for at least two months because they will have already been fertilized at the nursery. Carefully read the printed instructions that come with your plant or research on your own to make sure you know the fertilizing needs of each particular plant.
There are many good commercial fertilizers on the market made specifically for house plants. Carefully follow the label directions when fertilizing your plants and you will avoid over and under feeding your indoor plants.
Plants that have been over fertilized will have dried or burned leaves. If you feel you have over fertilized your plants, water them thoroughly from the top and discard the drained water for two to three weeks.