Are eggshells good for orchids? - Orchid Secrets
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Are eggshells good for orchids?

They can be if prepared correctly. Your orchid potting mix shouldn’t be thick enough for eggshells to decompose and turn into compost; so, grind them up in a mortar and pestle first before applying. That being said, in large concentrations, they may cause a phenomenon similar to fertilizer burn. 

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