Plants still need an appropriate balance of nitrogen, phosphorus, potassium, micronutrients, water, light, and healthy soil conditions.

So, should you start hanging a bag of eggshells in your garden?
If you regularly eat eggs, it’s a clever way to collect and dry something you might otherwise throw away.
The method is inexpensive, requires almost no effort, and gives you a steady supply of shells that can eventually be ground and added to compost, worm bins, or soil where appropriate.
Just don’t expect the hanging bag itself to magically fertilize nearby plants or chase every pest from the garden.
The real trick happens afterward:
Dry them. Crush them. Use them wisely.
Sometimes the simplest garden resources aren’t found in a bottle or bag at the garden center.
They’re already sitting in your kitchen.