Things You'll Need
Drying tray or cookie sheet
Drying food through dehydration, a common method of preservation, is one way to preserve fresh spinach. If stored properly, dried spinach lasts up a year. During this time you can add it to salads or rehydrate it in hot water for use in recipes. Although dehydrators are useful appliances if you dry food frequently, an oven also works well for removing moisture from food.
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Buy fresh spinach at a farmer's market or supermarket. Wash it with cold water to remove any soil or pesticide and cut off the stems.
Spread the spinach out in a single layer on a drying tray or cookie sheet.
Put the spinach in an oven set to 170 degrees Fahrenheit.
Leave the spinach in the oven for about six hours and turn the temperature down to 130 degrees Fahrenheit for the last hour. The spinach is dry when brittle.
Remove spinach from the oven and let it cool.
Put the dry spinach in air-tight containers and store in a cool, dark place.
To rehydrate dry spinach, put it in hot water with a small amount of lemon juice for about 15 minutes.