
Spears can be harvested by snapping or cutting. Though snapping is quick and easy, the ends do dry out more quickly. Bend the stalk near the base until it breaks and store in the refrigerator as soon as possible. For cutting, use a sharp knife and cut the spear slightly below the ground level. The base is woodier than a snapped stem so it doesn't lose water as quickly. Remove the woody base prior to cooking.
Asparagus should not be harvested the first year of planting. The second year, harvest for three to four weeks until the spear size decreases. Every year thereafter, harvest the spears for six to eight weeks. (Cynthia Domenghini)