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Attention Lazy Gardeners: Asparagus is a (Nearly) Free Ride
As I am sure you know, once upon a time there were three little pigs. One built his house of bricks, one of sticks, and the lazy one built a house of straw. I forget the details, but I think the lazy one got eaten by the wolf – a moral for all kids and gardeners. Work hard, survive. But one exception to that rule is the asparagus patch. Each year you can have delicious food relatively work-free.
Okay, I exaggerate. There is considerable work in starting an asparagus patch, and a certain amount of work in keeping it weed-free. But it should come back reliably, year after year. So plant it well and keep it mulched to hold down weeds, and you can garner rewards year after year.
Twenty-five plants is a reasonable number of plants for a family of four, or for two people with my appetite for those sumptuous green spears. Asparagus needs rich soil with lots of nutrients, so have a good supply of compost or aged manure and some slow release organic fertilizer at planting time.
Get a soil test done before you plant, or get at least get a kit that will tell you the pH. Asparagus does best with a near neutral pH, in the range of 6.5 to 7.5. If your pH is less than 6.5 you will need to add limestone to “sweeten” the soil. The test kit will tell you how much limestone you need.
Before planting, dig out all weeds and especially grasses. Rototilling does not kill weeds and grasses, it just hides them. And they will come back to plague you for years. So weed well.
Because asparagus lasts for many years, it is important to enrich the soil more than you would for annual veggies like tomatoes or lettuce. In the old days –back when I was a kid – asparagus beds were dug deep, and manure was worked into the soil down to a depth of 18 inches. Asparagus roots were planted in a trench with the crown (where the roots originate) planted a foot deep and 18 inches apart.
Preparing Asparagus bed
Current thinking is that asparagus still needs good loose soil, but that the crown only need be planted 6 inches below the soil line. Using a hoe or shovel, create a trench 9 to 12 inches deep and 12 to 18 inches wide. Then loosen the soil in the bottom of the trench with a spading fork. Space rows 2 feet or more apart.
Plan on working in 4-6 inches of aged compost into the soil down at the depth where the roots will be, and in the soil you will use for backfilling the trench. Don’t skimp, even if you have good soil. Work the compost in with a spading fork or shovel. A rototiller would also do the job, but can adversely affect soil tilth or texture if done when the soil is too moist. And rototilling disturbs microorganisms and earthworms in the soil.
I also like to broadcast a generous dose of Pro-Gro or other slow-release organic fertilizer everywhere in the planting trench and mix it in. A quart yogurt container of organic fertilizer is fine for a dozen plants. Azomite, a mineral mix that provides micronutrients is a good additive, too. Green sand is an organic source of potassium and micronutrients from the sea. All of the above should be available at your local feed-and-grain store or garden center.
Asparagus roots are now sold that are all male – generally anything that has the word ‘Jersey’ in the name is all male (Is New Jersey a macho state?). ‘Martha Washington’ is the classic asparagus variety, but it has male and female plants, so they produce seeds – and little seedlings. This is not good. You don’t want extra seedlings growing in your patch, as they will compete with your plants for water and nutrients, just like weeds. Of course, you can pull the seedlings growing under Martha, and re-plant them elsewhere, but that sounds like work to me.
Asparagus planting
In the bottom of your trench build mounds of soil/compost mix. Drape the roots over the mounds with the crown sitting on top the mound. If the roots are longer than your trench is wide, swirl the roots around the mound a little. Then gently backfill your trench (or hole, if you did individual holes instead of a trench). Just an inch or two of soil is all that is required at the start. As the season progresses and the sprouts grow, add more soil/compost mix. By the end of the summer your plants should have 6 inches of soil over the crown.
A few recommendations: Have patience. Don’t pick any spears this year. Next year, just take one or two stalks per plant. Each year, take more – but never pick for more than 4 weeks. Taking too many spears will draw down their reserves and weaken the plants.
Keeping your asparagus patch well-weeded is important. Wood sides to an asparagus bed can help keep out creeping grasses, or you can dig a little moat around the bed to keep grasses from creeping in. Mulching with 6 pages of newspaper and 4 inches of straw will help keep down weeds and will hold in moisture.
Even if you are the quintessential third pig when it comes to gardening, don’t be lazy when planting asparagus. A little extra work now getting out weeds and working in healthy soil additives will pay you back many times over. Bon Appétit!
Henry Homeyer is a gardening consultant and author living in Cornish Flat, NH. His Web site is www.Gardening-guy.com.