Till or spade to a depth of 10 to 12 inches and turn the soil so all organic matter is covered. Asparagus grows well in high pH soils but does not do well if the soil pH is below 6.0. Test the soil before planting the beds and add lime if needed to adjust the pH to 6.5 to 7.0. Add an additional 1 to 2 pounds per 20 feet of row after the last harvest. Water the fertilizer into the soil.
Low fertility can cause fibrous spears.
Varieties Martha Washington, UC 157, Jersey Giant and Mary Washington tests have shown hybrid asparagus varieties produce more than the standard varieties, but they are not widely available to home gardeners. Planting Since asparagus will be in the same place several years, it is important to select the right spot. Asparagus plants make a good border around the edge of a garden or along a fence. After asparagus beds are tilled, mark rows 4 to 6 feet apart. Dig a furrow 4 inches wide and 6 to 12 inches deep.