How to Use Eggshell Water
Steep crushed eggshells in a pot of just-boiled water
Let the mixture sit for 12–24 hours
Strain, then use the mineral-rich water to irrigate your plants
Store any leftovers in a sealed container for up to a week
A Few Cautions
Don’t use too many shells in one spot—they can raise the pH and make the soil too alkaline.