why crushing them makes a difference.
The finer the shell particles, the greater the surface area exposed to soil and moisture.
Best method:
Rinse the shells.
Allow them to dry completely.
Crush or grind them finely.
Add them to compost or appropriate garden soil.
Don’t expect immediate results. Think of eggshells as a slow garden amendment rather than a fast fertilizer.
6. What About Tomatoes and Blossom-End Rot?
This is where eggshell advice often becomes misleading.
Many gardeners add eggshells around tomatoes because blossom-end rot is associated with calcium problems
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