I remember reading that soaking eggshells in water, and then watering houseplants with the water, would help the plants thrive. Is that true? Will the water really leach-out the nutrients in the shell, and transfer them to the plant?
-JT
eggshells have a lot of nutrients and one of the biggies for tomatoes is calcium. If you crumble the egg shells with your hand, they will release the nutrients slowly.
If you grind them into a powder, they will release faster. There are various formulas for using eggshells. If you combine equal parts eggshells, Epsom salts, bone meal, dried banana peels, you will get a really great booster for your plants.
These can be used by addition to water, or simply put into the hole at transplant time and watered in. Sometimes I put stuff in the blender with water and whirl it then dilute it further and water the plants.
Sometimes I just put a few spoonfuls on the dirt and water it in. Short answer is yes eggshells will help plants especially those that might be prone to blossom end rot.
You can blend the eggshells with some liquid to make them pourable and scrapable into the garden.