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Nut shells can be repurposed for indoor plant care by creating a simple infusion. This infusion serves as a supplementary aid rather than a primary nutrient source. To prepare it, clean and chop the shells, steep them in hot water for 24 hours, and dilute before use. Suitable plants include African violets, peace lilies, anthuriums, and Phalaenopsis orchids, which require careful watering and specific nutrients. However, it's crucial to remember that nut shells do not replace regular fertilizers and should be used cautiously.