Immediately in the soil, they are only good for aeration until it fully breaks down. Then it will add potassium, phosphorus, calcium and carbon into the soil. This will benefit most plants, no matter what kind. This makes a wonderful soil amendment. Here is an article that will help: https://www.gardeningknowhow.com/composting/ingredients/eggshells-in-the-garden.htm
Answered on March 4, 2019
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