How to grow asparagus in raised beds. Asparagus is a perennial vegetable plant that can be a long-lasting, permanent addition to a home garden. This vegetable requires well-draining soil to thrive; waterlogged soil can cause the roots of the asparagus plant to rot. Growing asparagus in raised beds offers them well-draining soil, as well as being a more convenient way to plant asparagus, since it does not require that you till the soil deeply with a rotary tiller.
Allow asparagus to grow without harvesting the year it is planted. In the second year, harvest spears that are 1/2-inch in diameter, but only for two weeks. Cut or break off 7- to 9-inch-long spears with tightly closed tips. In subsequent years, harvest for five to eight weeks, then allow the shoots to develop into ferny growth to build up the roots for the following year's crop.