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Dried Banana Peels as a Plant Fertilizer! Bananas are not only wonderful sources of potassium for people, but their peels are a great source of phosphorus, potassium and other important trace minerals for plants.
Self-watering planter made from recycled bottles. (I'd want to try this with a 2-liter plastic bottle, and cut the top off, so I could get the root system out intact for transplants.)