Fertilizers potted plants for indoor decoration are usually marked with a number such as 20–20–20. These numbers indicate the percentages of nitrogen, phosphorus, and potassium respectively, the three elements that are needed in the most quantity for plant growth. Nitrogen is essential for green, leafy growth. Phosphorus is essential for flowering or fruiting plants. Potassium is essential for strong roots and increased nutrient uptake. Numbers higher than 15 are usually man-made, chemical fertilizers. Organic fertilizers have a much lower ratio. A 4–2–2 ratio of these elements is usually good for green foliage plants, while a 2–6–4 ratio is usually better for flowering plants. A complete fertilizer will also include the minor and trace elements, such as calcium, magnesium and iron.
While variation may occur between brands, a general rule is to mix 1 tablespoon to every gallon of water. In all cases, it is better to under-fertilize than over-fertilize. The diluted mixture is then used to water the plants. The growth of the plants should be monitored to determine if the fertilizer is helping or harming, and how often (if at all) it should be used. Schedules can range from every other week to every three months. For convenience, granular, time-released fertilizers are also available.
So we can fertilizing potted plants for indoor decoration now