Household Nutrition Powder for Stronger and Healthier Plants You can use houseplant fertilizer. Dissolve the fertilizer in water and spray around the plants. You can use this fertilizer all year round, but it is better to reduce the dose during the winter months. How to use: Fertilize once a week at a rate of 3 g per liter of water (use the inside of the can to measure accurately). Dissolve the powder in lukewarm water. In the winter months, reduce consumption by half. Dissolve the dissolved fertilizer evenly around the plant. Spread. Keep the fertilizer at room temperature.