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

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?
13 Mar 24, Peg (USA - Zone 10a climate)
Can I still plant crowns in March? What varieties are suggested for my area? Florida zoom 10. Can I plant them in the ground or would a grow bag be better?
02 Mar 24, Nancy (USA - Zone 9b climate)
I planted crowns last year in a raised bed. As of today, March 2nd, I have a lot of spears and ferns that are 3-4 feet high. Do I continue to let them grow or cut it all down at the soil level? Can’t seem to find the right answer.
25 Mar 24, Jill C. (USA - Zone 8b climate)
You must be south of me. I'm in Bastrop. My "ferns" (not sure what to call those) are over 5 feet tall now! I'm going to let them grow now until they die out when it freezes. I got one spear the first year!
25 Feb 24, Sherry L (USA - Zone 8b climate)
Zone 8b, Central Georgia. Since we have pretty hot, scorching summers, would it be better to plant asparagus where it doesn't get full afternoon sun? Just afraid it couldn't take the heat.
15 Feb 24, John spence (USA - Zone 7a climate)
When and how is the best time to plant asparagus seed in zone 7a
19 Feb 24, (USA - Zone 9a climate)
Best time to plant crowns is February and March or November and December
11 Jan 24, James Bushdid (USA - Zone 9b climate)
Growing instruction in zone 9B, Ormond Beach, Florida.
21 Jan 24, James Bushdid (USA - Zone 9b climate)
Trying to grow from seed Mary Washington Asparagus any help you can give an old retired man. Thank you. (Area, EAST COAST OF FLORIDA, ORMOND BEACH, FLORIDA.
14 Jan 24, (USA - Zone 7a climate)
Google how to grow it.
Showing 1 - 10 of 557 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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This planting guide is a general reference intended for home gardeners. We recommend that you take into account your local conditions in making planting decisions. Gardenate is not a farming or commercial advisory service. For specific advice, please contact your local plant suppliers, gardening groups, or agricultural department. The information on this site is presented in good faith, but we take no responsibility as to the accuracy of the information provided.
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