Tip: Did you know about this Natural houseplant fertilizer?

I never thought to soak them in water. I like that! I was crushing them up and throwing them into the garden bed.

If you have egg shells from boiling eggs you can safely crush them and use on your garden. However if you have cracked eggs to use in cakes or such before crushing them either boil the shells in water or bake them separately while cooking your cake. I. This way you have no danger of E. coli. Crushed eggs help stop blossom end rot on tomatoes .

Pulverized cleaned dry eggshell and put into a container with vinegar. .(I used a spice/coffee grinder. ) The vinegar "pulls" the calcium out of the shells and the calcium is usable right away by your plants, rather than having to break down into the soil. Just dilute the solution in water and use to water your plants (tomatoes love this). Do NOT put a cap or cover on the container as there is a chemical reaction that happens as the calcium is processed.

I pulverize the shells and use it with my worm castings. The worms love it and the plants love the castings.