QUESTION: How do you compost eggshells?
ANSWER: Eggshells are technically safe for composting and will add calcium to the finished compost, which speeds plant growth, aids in building cell walls, and helps prevent blossom end rot in vegetables that are susceptible to the disease, such as tomatoes and squash. When you’re composting eggshells, you just need to break them into smaller pieces so they’ll decompose more quickly and finish with the rest of your materials.
It’s also a good idea to bury the eggshells in the compost a bit instead of letting them sit right on top of the pile. Eggshells that are on top of the compost heap can attract rodents and other unwelcome pests. If you don’t want to bury your eggshells, the next best thing is to rinse them clean before adding them to your compost heap.
However, there are a lot of reasons why you might not want to compost eggshells at all if you are worried about attracting pests and the long time period for them to break down.