Growing Asparagus

Aspargus officianalis : Asparagaceae / the asparagus family

Jan F M A M J J A S O N Dec
    S                  
        T              

(Best months for growing Asparagus in USA - Zone 5a regions)

  • S = Plant undercover in seed trays
  • T = Plant out (transplant) seedlings
  • Easy to grow. Plant as crowns. Best planted at soil temperatures between 61°F and 86°F. (Show °C/cm)
  • Space plants: 8 - 16 inches apart
  • Harvest in 2-3 years. Plant 'crowns' to harvest earlier .
  • Compatible with (can grow beside): Parsley, Basil, Nasturtiums, Lettuce
  • Avoid growing close to: Garlic, Onions, and root vegetables
  • Asparagus growing
  • Baby Asparagus Seedlings (approx 6cm/3in) ((c) Liz Hutchinson)

Plant crowns (roots) 20 - 40 cm apart and a few cm (1 inch) deep in well manured soil. The asparagus shoots grow in spring. Harvest the shoots which are bigger than 1 - 2 cm/half-inch in diameter. Leave the rest to grow into the leafy ferns (1.5 m/5 - 6 ft tall) which will feed the crowns to give a crop next year. In autumn the ferns will be covered in bright red poisonous berries.

Leave the ferns to die down in autumn, then trim off the dead stalks and pile on plenty of rotted manure/compost to give the roots plenty of food to produce new stems in spring.

Harvest by cutting off the stalk, close to the ground. From the third year you can get an additional crop by letting the first lot of ferns grow, then bending down the stalks to break them. A second crop of shoots will grow and can be harvested. Leave subsequent shoots to grow on to ferns. Asparagus does not like continuously wet and warm soil. It grows better where there is a cool or frosty season.

Culinary hints - cooking and eating Asparagus

Steaming is traditional, then coating with melted butter or hollandaise sauce.
Alternatively break in short lengths, and cook quickly in hot oil in a wok and sprinkle with soy sauce or balsamic vinegar.

NOTE: The asparagus berries are poisonous. Only the young shoots are edible.

Your comments and tips

11 May 25, Anne Marie (Canada - Zone 5b Temperate Warm Summer climate)
Hi. I live in a coastal region in Newfoundland where I get wind and salt spray. Is asparagus tolerant of these conditions? Thanks, Anne Marie
29 Mar 24, Jim Bell (Canada - Zone 5b Temperate Warm Summer climate)
I was planning on planting asparagus between my grape vines which are new and will be I’m hoping on wires 4 ft above ground. Would the ferns be too high to grow without shading out the grapes?
09 Apr 24, Mike (Australia - sub-tropical climate)
I would suggest you don't. Asparagus need their own area to grow in "full sunlight". They will be there for 20+ years and they spread a bit as the crown grows. You pick the new asparagus shoots (they need full sun then) for about 10-12 weeks and then let the ferns grow (they reach about 4').
26 Mar 24, Rod Ferguson (Canada - Zone 4b Temperate Warm Summer climate)
I live in Midland, 50 miles north of our largest harvesting area Allison. Asparagus is my favourite vegetable but Ontario seems to have a season of only a month or so. How does asparagus from Mexico or Peru be available year round? If asparagus was planted in northern Ontario—such as in the agricultural belt near New Liskeard—would our harvesting time be correspondingly extended?
15 May 23, (Canada - Zone 2b Sub-Arctic climate)
I have a single shoot growing from 2 plants that are 12–14in tall already in middle of May. Should I cut these down now?
19 May 23, (Canada - Zone 2b Sub-Arctic climate)
Let them grow for the first 2-3 years.
11 Oct 20, Mike G (Canada - Zone 2b Sub-Arctic climate)
Hi I want to try growing asparagus I live at Wasaga Beach, Ontario Canada what is best method to produce healthy productive plants and our winters are very cold often hitting-40 degrees Celsius what is best method to winterize .
12 Oct 20, Mike G (Canada - Zone 6a Temperate Warm Summer climate)
Yikes, my error our climate is zone 6a. If someone could provide me with the Answers to the above questions I would be appreciative.
29 Oct 20, Anonymous (Australia - sub-tropical climate)
Check the planting time from the planting calendar in Asparagus page. Also google how to grow and harvest it.
03 Feb 20, ASHWANI BHATNAGAR (Canada - Zone 8a Mild Temperate climate)
Hi, I live in Vancouver, BC, Canada. I want to start growing Asparagus in my very small backyard to start with. I am looking for someone who can guide me. I am ready to pay consulting fees. Please advise. Best Regards, Ash
Showing 1 - 10 of 14 comments

The transplanted ones will depend on how they were treated last year - whether they were left to build up energy reserves for this year. If you had plenty of spears grow into ferns then they should produce this year. Probably also depends how old the old crowns are. Last year while I was growing mine from 12 mth crowns to 24 mths I use to put about half a cup of fert in 9 L of water and feed them each month - only had 3 crowns. I also put manure/compost on in august. I have crowns that are coming up to 3 years old - that is from when seeds were planted - they have been shooting spears for a few weeks now - I have cut them back and manured and watered them. My seedlings which will be 12 mths old in Sept - I have not cut them back yet or put manure on them yet - will probably do that in about two weeks time. I have not watered them for the last month - they are not growing at the moment. As for manure - chicken is the richest in N followed by cow and then horse manure. I read the other day horse is about 1.75% N. Whatever manure you can get and add some fert if you like. We have had only one week of cool weather so far this winter - that is night temps down to 6-8 degrees.

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