Throughout the United States, except in the Southeast.
Set crowns, buds upward, in a trench 6 to 8 inches deep, and 12 inches apart. As the plants grow, gradually fill in the trench with soil until even with the surrounding soil.
Use a high-quality garden soil.
Water deeply and thoroughly when the soil is barely moist. Do not let the plants dry out.
Feed once in the spring with a continuous-release plant food for vegetables, and again in the fall after harvest.
Plants must grow for 2 years before harvesting to build strong roots to ensure crops for at least 10 years. In the spring of the third year, pick when the spears are 7 to 10 inches tall with tight heads. To avoid wounding the crown, snap the spears, do not tear or cut them. Harvest for 2 weeks. The fourth year, pick for 4 weeks, and the fifth and following years for 8 weeks.