Spinach can have either flat or slightly crinkled leaves. It is often available as baby spinach, which is especially useful for salads. Spinach can be purchased fresh, frozen, or tinned. Fresh spinach is sold in bunches or already washed and sealed in plastic bags. A number of other greens that are similar to spinach are often sold in specialty supermarkets. These include New Zealand spinach, which comes from a different plant family.