Planting Instructions: Start the seeds indoors or in a greenhouse 60 to 90 days prior to your last expected frost date. Direct seeding into the garden is not recommended. Soil temperature is important for germination but even under perfect conditions, germination can take quite a while. Soaking seeds in warm water for four to six hours or nicking the seed coats prior to sowing will improve germination times.
Choosing the location to establish your asparagus bed is important. This is a "homesteading" task and one that many pioneers performed. You can still find asparagus beds along the old
fence lines of many an old homestead property. The point here is to not only choose a location with the optimal growing conditions, but one that you will be happy with for years to come.
Choose a location that receives full sun.
Four to six hours of daily sunlight would be considered a minimum amount.
Since the plants like to grow deep roots, well drained, heavily composted soil is required. Asparagus likes to be fed - manure and compost are very important to successful crops. A good, balanced, organic fertilizer with a composition of 10-10-10 applied in the spring is beneficial.
If you live in a location where the winter soil can freeze, trim the plants in the fall and cover the bed with six inches of straw or a foot or so of leaf mulch. In the spring, as the temperatures start to rise, uncover the beds and allow them to gradually warm up. This is also the right time to apply your spring fertilizer feeding. Mulching over winter also helps reduce the weeding task. Maintaining a weed free asparagus bed is also very important.
As previously noted, it is very important to allow your plants to become established and for the root crowns to grow big and strong. By not harvesting for a few years, it allows the plants to grow and store food reserves in the roots that will result in larger spears the following year.
(Ohio State University Extension Service Fact Sheet, "Growing Asparagus In The Home Garden")
(Asparagus Production In California, Detailed, Four Pages, Adobe Acrobat Reader Required)
(Texas Agriculture Extension Service Asparagus Fact Sheet)