why are eggshells good for a flower or vegatable garden or are they?

i read it somewhere in a book

Answers:
Eggshells are 93% calcium carbonate. In addition to the calcium, the eggshells contain about 1% nitrogen, about a half-percent phosphoric acid, and other trace elements that make them a practical fertilizer.

Other answers:
Eggshells release calcium and other minerals into the soil as they break down, and that's beneficial to the soil and plants.
Eggshells release calcium and other minerals into the soil as they break down, and that's beneficial to the soil and plants.
I've often heard they are good for gardens and composts. Believe it or not, I've heard many people say to bury a fish in your flowerbed or garden. You can research this if you don't believe me. I'm sure you'll find more information on this.

Anything good for a compost should be good for flowerbeds.
I know that they keep slugs away
the shells contain trace elements,phospherous,calcium, used by plants
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