Are Apple Sauce Carrot Pineapple Egg Shells Good For Citronella Plants?

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Answer 1

All of these materials can be successfully turned into compost, which is helpful in the garden.
Here's an article about what to put in compost: https://www.gardeningknowhow.com/composting/ingredients/what-can-you-compost.htm. Eggshells can be put directly into the soil, as this article states: https://www.gardeningknowhow.com/composting/ingredients/eggshells-in-the-garden.htm
As to fertilizing citronella, you may just want to use a balanced fertilizer, or one with a 5-10-15 content.