You are doing it wrong. Here’s what fertilizer to use on what houseplants

2. 🥚 Eggshells
Why: Add calcium and lower soil acidity.
How to Use: Rinse and dry eggshells, crush into fine powder (coffee grinder works best). Mix 1 tablespoon per plant into topsoil or steep 5–6 crushed shells in 1 quart of water overnight and use the liquid monthly.
Best Used On: Calathea, Monstera, Spider Plant, Begonia, indoor tomato plants.
Avoid On: Gardenias, Azaleas, Peace Lily—these thrive in acidic soil.