Do you buy spinach at the supermarket with the best of healthy-eating intentions, only to find those leafy greens have turned to slime days later? Extra Crispy is here to help with advice on how to store spinach so it stays fresh for as long as possible. When you bring your spinach home, pick out any leaves that are already yellowing and appear past their prime. Then wash the remaining leaves and dry them thoroughly with a salad spinner or paper towel. Once leaves are completely dry, the best way to store them is in a salad spinner or a hard-edged container lined with paper towels.