Hello @anggreklestari. I didn't know that eggshells were a source of protein for a garden. I guess it's a good ingredient that would be fit for composting. I must say that your gardening skills don't resemble those of a beginner. It's good that you are quick learner so that you can put all your research into practice quickly to produce a good gardening season. Your plants look so healthy.
Thanks for sharing this info. Take care and happy harvesting.
!LADY