Absolutely, you should be fertilizing your houseplants—here’s a guide to get you started.

Houseplants can truly enhance your space—especially when you lack access to a large garden or outdoor area. They not only bring vibrant color and life to a room, but the right planters can serve as a lovely design feature. However, there’s a catch: Unlike outdoor plants, houseplants don’t have a continuous supply of nutrients from the soil. Eventually, the nutrients in the potting soil will deplete, and your plants may begin to struggle. Regularly fertilizing your plants helps keep them thriving.

Which Type of Fertilizer Is Best for Your Plants?

Not all fertilizers are the same. In fact, using the wrong type or an excessive amount can harm your houseplants. "The wrong kind or delivery method can be overwhelming for the plant," says Patrick Hillman, plant expert and owner of Buzz and Thrive Gardens. "I advise my clients to use a water-soluble fertilizer, specifically a rich fish emulsion fertilizer. Organic options tend to nourish plants longer than chemical alternatives."

How to Apply Fertilizer

It’s simpler than you might think, but don’t just pour fertilizer directly into your plants. Hillman suggests diluting the fertilizer at a ratio of ¼ to ½ teaspoon per gallon of water. "I recommend diluting it a bit more than the instructions suggest to be cautious," he explains.

Another useful tip is to water your plant before applying fertilizer. This prevents the fertilizer from burning the roots, and moist soil helps the fertilizer absorb more effectively. If you’re concerned about the odor of fish emulsion fertilizer, it’s true—it can smell, but Hillman assures that the scent dissipates after a day or two. If your pot has a drainage tray, make sure to discard any excess fertilizer water.

When to Apply Fertilizer

Feed your plants every two to three weeks from the end of March through mid-September, and then stop fertilizing once autumn hits. "It’s beneficial to give the plants a break," Hillman advises. "As the days grow shorter, plants won’t be producing as much new growth, so they won’t need as much water or nutrients."

New Growth, Now What?

Monitor your plants to see if their roots are outgrowing their pots or planters. Spring is the perfect time to assess whether any plants need to be moved to slightly larger pots, Hillman suggests. If repotting is needed, consider adding some compost as well.

Plants You Should Not Fertilize Often

Succulents and cacti don't thrive on nitrogen-heavy fertilizers, says Hillman. Use them sparingly—once every six weeks is plenty. Also, providing your plants with high-quality soil and compost can help them grow stronger overall.