Think of light as the plant’s breakfast and fertilizer as a multivitamin. Fertilizer supplies useful nutrients, but it cannot replace the light that gives a plant energy. If a houseplant is not receiving enough light, additional fertilizer will not make up the difference and may cause more harm than good.
When is the Best Time to Fertilize My Houseplants?
The best time to fertilize most houseplants is when they are actively growing. This often happens during spring and summer, when longer days and brighter light encourage plants to produce new leaves, stems, roots, or flowers.
Rather than relying only on the calendar, watch the plant. Fresh growth is a good indication that it may be ready to use additional nutrients.
How Should I Fertilize My Houseplants?
You can fertilize houseplants with a slow-release fertilizer or a water-soluble fertilizer. Both can work well when applied according to the product directions. Slow-release fertilizers are mixed into or applied to the top of the potting mix. Water-soluble fertilizers are diluted with water and applied while watering. The difference is that slow-release fertilizers feed the plant gradually over an extended period, while water-soluble fertilizers make nutrients available more quickly and need to be applied more often. Because products vary in strength and how long they feed, always follow the instructions on the package.
How Often Do I Fertilize?
Generally speaking, you can feed most houseplants during Spring and Summer with a houseplant fertilizer. Some houseplants, such as orchids, are heavier feeders and can be fertilized more often. It is best if you know what plant you have and what it needs to thrive. Some plants don't need fertilizer at all.
How Much Fertilizer Do I Give My Houseplant?
Always follow the directions on the package. Too little fertilizer may do little to help your plant, but too much can cause problems. Fertilizer salts can build up in the potting mix and burn the roots, limiting the plant’s ability to take in moisture and potentially stunting its growth. Or the opposite may happen: The plant may produce excessive leafy growth but fewer flowers. In some species, overfertilizing may also cause discoloration along the edges of the leaves.
Should I Stop fertilizing in winter?
You can usually pause or reduce fertilizing when a houseplant stops actively growing. Many houseplants grow more slowly during winter because the days are shorter and less light is available. Feeding a plant that is not actively growing can allow unused fertilizer salts to accumulate in the potting mix. If your plants continue producing healthy new growth because they receive consistently bright natural light or supplemental grow lights, they may still benefit from fertilizer. Let the plant’s growth and growing conditions guide you rather than the season alone.
