This fertilizer provides a balanced mix of nutrients, which is what makes it so suitable for a wide array of plants. It contains 4% nitrogen, 6% phosphorus, and 5% potassium. It's made from fish bone meal, alfalfa meal, fish meal, potassium sulfate, and kelp meal. Use it once a month for houseplants and about once every eight weeks for flowers, trees, and shrubs.

This liquid plant food is an all-purpose houseplant fertilizer by Miracle-Gro. The balanced fertilizer has an even N-P-K ratio of 1-1-1. The handy pump application means you can feed plants directly from the bottle. Or, you accurately measure fertilizer to dilute with water to hydrate all types of houseplants. This simple test kit allows you to test your soil’s level of nitrogen, pH, potash, and phosphorus. It comes with indicator cards that will give you accurate measurements so you can adjust your homemade plant food’s nutrient levels to be the optimal range for your plant’s growth and health. Recipe One – Coffee GroundsThis formula is relatively potent, providing 24% nitrogen, 8% phosphorus, and 16% potassium. This is a good amount more than a number of other fertilizers designed for houseplants. The high concentration of nitrogen can help foliage plants grow, and the phosphorus will give flowering plants a boost, too. Whichever approach you choose, banana peel is one of the best homemade Indoor plant foods you can make. For best results, lightly mix the top layer of soil over the fertilizer. If you have pots deeper than 4 inches, keep in mind that ¼ teaspoon is required for every 2 inches of pot width. For larger cacti, this can get pricey. It contains 1% nitrogen, 1% phosphorus, and 1% potassium to help your plants store energy and get them growing and flowering. The gentle formula is urea-free to prevent burnt roots, while the magnesium promotes vibrant color and a shiny appearance. Plants get their food during photosynthesis when they get energy from light. Plants absorb carbon dioxide from the air and water from the soil. These combine to produce sugars that the plant uses for food. So, plants feed themselves by making their own food. If you’re looking for a plant food that’s made with natural ingredients, liquid seaweed and kelp fertilizer is a great option. Kelp boosts root and stem health—and when plants are healthier, they can better withstand environmental stressors like disease and insects. Plus, it’s much harder to burn your plants with an organic fertilizer.

For best results, apply the liquid, all-purpose fertilizer two to four times a month. The balance of micro- and macro-nutrients will help replenish lost minerals in plant soil. 7. Jobe’s Indoor Plant Food Spikes The best fertilizer for indoor plants should be easy to use, and we love that Jobe’s Indoor Beautiful Houseplants Food Spikes make plant care nearly effortless. Just insert the spikes into the soil around the plant, halfway between the stem and the edge of the pot. Compared to some liquid fertilizers that have to be applied at every watering, these spikes are a very low-maintenance option, and you only need to add new spikes every 60 days.Granular fertilizers—This type of fertilizer is best when repotting a plant in fresh soil. The granules are worked into the soil, and they release nutrients when you water the plant. Similar to slow-release fertilizers, it’s difficult to control the strength of fertilization. A good potting mix and a regular watering schedule go a long way towards keeping your houseplants happy but to help your plants truly thrive indoors, you may need to apply fertilizer.