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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.
If started from seed, asparagus will take about 3 years to become productive. One-year-old asparagus crowns will need two years of growth prior to harvesting and two-year-old crowns, just one year. Be patient the first year of cutting by limiting spear harvesting to a 10-day period.