How To Grow Asparagus In Minnesota

To grow asparagus in Minnesota, you need to embrace the state’s distinct four-season climate and choose the right varieties, planting techniques, and care routines.
 
It’s totally doable, and once you get a patch established, it can produce for 20 years or more.
 
Minnesota’s cold winters and short growing season might seem like a challenge, but asparagus is a hardy perennial that actually thrives when you work with the local conditions.
 
The key is to start with the right variety, plant at the correct time, and give your crowns a good head start before the ground freezes.
 
In this post, we’ll walk through exactly how to grow asparagus in Minnesota, from picking the best type to harvesting your first spears.
 
Let’s dig in.
 

How to Grow Asparagus in Minnesota: The Basics

Growing asparagus in Minnesota starts with understanding that this crop is a long-term investment.
 
Unlike annual veggies, asparagus takes a few years to get going, but once it does, it rewards you with fresh spears every spring.
 
The first step is choosing a variety that can handle Minnesota’s cold hardiness zones, which range from 3a to 5a.
 
Look for all-male hybrids like ‘Jersey Knight’, ‘Jersey Giant’, or ‘Millennium’ because they produce higher yields and don’t waste energy on seed production.
 
You can also try heirloom ‘Mary Washington’, but it’s a bit less productive.
 
When learning how to grow asparagus in Minnesota, variety selection is your foundation.
 

1. Start with One-Year-Old Crowns, Not Seeds

Seeds are cheap, but they add a whole extra year to the process.
 
In Minnesota’s short season, you’re better off buying one-year-old crowns from a local nursery or online supplier.
 
These crowns are dormant roots that will sprout quickly once planted.
 
Soak them in water for a couple of hours before planting to rehydrate them.
 

2. Pick a Sunny, Well-Drained Spot

Asparagus needs at least six to eight hours of direct sun.
 
And it absolutely hates soggy roots, so avoid low spots where water pools after rain or snowmelt.
 
Raised beds work great in Minnesota because they warm up faster in spring and drain better.
 
If you’re planting in the ground, amend heavy clay with compost and sand.
 

3. Plant in Early Spring, As Soon As Soil Can Be Worked

Timing is critical when you grow asparagus in Minnesota.
 
You want to plant crowns about four to six weeks before the last expected frost, which is usually late April to mid-May.
 
The soil temperature should be at least 50°F.
 
Dig a trench about 12 inches wide and 6 to 8 inches deep.
 
Set crowns 18 inches apart, cover with 2 inches of soil, and gradually fill the trench as shoots grow.
 

Caring for Asparagus Through Minnesota’s Seasons

Once planted, your asparagus patch needs consistent care to survive winter and produce for decades.
 
Minnesota’s freeze-thaw cycles can heave young crowns out of the ground, so mulch is your best friend.
 
Apply a thick layer of straw or shredded leaves after the ground freezes in late fall.
 
This keeps soil temperatures stable and prevents winter injury.
 

1. Water Deeply but Infrequently

Asparagus has deep roots, so you want to water thoroughly once a week during dry spells.
 
In Minnesota, summer rains often do the job, but don’t let the soil dry out completely during spear production.
 
Avoid overhead watering late in the day to prevent fungal diseases like rust.
 

2. Fertilize in Early Spring and After Harvest

Feed your patch with a balanced fertilizer or compost in early spring before spears emerge.
 
Then again after harvest ends in late June.
 
This helps the ferny foliage grow strong and store energy for next year’s crop.
 

3. Control Weeds Early and Often

Young asparagus doesn’t compete well with weeds.
 
Mulch heavily and hand-pull or carefully hoe around the crowns.
 
Once the patch is established, the dense fern canopy suppresses most weeds on its own.
 

4. Cut Back Ferns After Frost

In late fall, after the ferns turn brown and die back, cut them to about 2 inches above the ground.
 
This removes overwintering pests and diseases.
 
Don’t cut them earlier, because the green ferns are still photosynthesizing and feeding the roots.
 

When and How to Harvest Asparagus in Minnesota

Patience is everything when you grow asparagus in Minnesota.
 
You should not harvest any spears the first year after planting.
 
In the second year, you can take a very light harvest for about two weeks.
 
By the third year, you can harvest for four to six weeks, usually from late April through early June.
 
Snap spears off at ground level when they’re 6 to 8 inches tall and tips are tight.
 
Stop harvesting when spears become thin and pencil-like, which means the plant needs to rebuild energy.
 

So, How to Grow Asparagus in Minnesota?

To grow asparagus in Minnesota, you need cold-hardy varieties, well-drained soil, and a commitment to a few years of patience.
 
Plant one-year-old crowns in early spring, mulch heavily for winter, and harvest lightly starting in year two.
 
With the right care, your Minnesota asparagus patch will produce tender spears for decades.
 
So pick a sunny spot, grab some ‘Jersey Knight’ crowns, and get ready for a rewarding perennial harvest.