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I've had good luck addingI've had good luck adding bone meal to my container plants, either mixed in with the soil at initial transplant or sprinkled lightly on top of the soil. Coffee grounds provide a nice hit of nitrogen. Epsom salts are an inexpensive product for giving your plants a boost of magnesium. Just sprinkle a tablespoon or so around the base of a plant and soon it will green-up nicely.

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