The calcium carbonate in eggshells helps to strengthen a plant's roots so it can grow faster and stronger. Simply crush clean, dry eggshells into a fine powder. Add the powdered eggshells to boiling water, then cover and store the mixture for one week, uncovering it only once daily to stir it.
The first way you can use eggshells in your houseplants is to grind them up. First, clean the eggshells and allow them to fully dry. Once dry, add them to a coffee grinder or food processor and grind until you have a fine powder.
Once you have a fine powder, how you "feed" your plants is key. According to Khoa Hoang, Brightly’s product designer and resident plant expert, fertilization starts at the roots of your plants. Because of that, simply sprinkling eggshells on the top of the soil in hopes that the nutrients trickle down won't cut it. Instead, he recommends working the eggshell powder into the soil.
