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Vacuum sealing asparagus is the preferred method of freezing asparagus because it removes the cold air that causes freezer burn, or oxidation and dis-colorization of the spears, which can cause the spears to have an off taste that will spoil the flavor and texture of the asparagus.
Vacuum sealing the asparagus spears allows you to freeze the spears without the blanching, keeping the texture fresh and the color at optimum green. Drying asparagus is also a good way to preserve asparagus. This method is great for use in soups and can be taken camping, to use in stews and campfire cooking.