Now this isn’t for houseplants, but my uncle always saves things like eggshells, vegetable peels, etc, in an old milk carton, and then mixes them into the soil around his vegetable plants in his garden. He’s always had the best gardens, so there’s definitely something to it. Kathy
4 or 5 empty eggshells 4 C. water
Put eggshells in water and let stand for 24 hours.
Remove the shells and water the plants with this mixture. [snipped for brevity]