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I eat a banana everyday, and always throw the peel away, I also drink tea everyday and throw out the tea bags. I have now tried throwing the tea bags and banana peels in water, making a tea out of it, and it helps your plants stand up and cheer! The potassium in the peels, and the antioxidant in the tea are a great combination for plants. I put them in a bucket of water, let sit overnight, and use the "tea" as a pick me up for plants, both indoors and out.
They seem to love it.
Source: A gardner friend had read about this, but hadn't tried it yet.