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You grow asparagus crowns by planting one-year-old dormant roots in deep, well-drained soil, and then leaving them undisturbed to establish for years.
If you’ve been wondering how to grow asparagus crowns successfully, the secret is patience, because asparagus is a long-term perennial that rewards you with decades of harvests when planted correctly.
Growing asparagus crowns isn’t difficult, but timing and soil preparation matter more than almost anything else.
In this post, we’ll walk through exactly how to grow asparagus crowns, from choosing the right roots to planting them at the proper depth and caring for them season after season.
Let’s dig in.
How Do You Grow Asparagus Crowns Successfully?
You grow asparagus crowns successfully by starting with healthy dormant roots and giving them the right environment from day one.
Here’s what makes the biggest difference.
1. Start With Quality One-Year-Old Crowns
When you grow asparagus crowns, always begin with fresh, firm one-year-old roots from a reputable supplier.
These crowns already have a developed root system, which gives them a huge head start compared to seeds.
Look for crowns that are plump, free of mold, and have visible buds or “eyes” on the crown.
If you’re growing asparagus crowns from seed instead, you’ll need an extra year before they’re ready to plant out.
2. Choose a Permanent, Sunny Spot
Asparagus crowns need full sun and a spot where they can stay put for 15 to 20 years.
Because you grow asparagus crowns once and harvest for decades, pick a location you won’t need to dig up later.
A raised bed works wonderfully if your native soil is heavy clay or drains poorly.
3. Prepare Deep, Rich, Well-Drained Soil
Before you grow asparagus crowns, amend the soil generously with compost and aged manure.
Asparagus roots dive deep, so loosen the soil at least 12 to 15 inches down.
Good drainage is non-negotiable because soggy roots rot fast, and that’s the quickest way to fail when you grow asparagus crowns.
A soil pH between 6.5 and 7.5 keeps them happiest.
When and How to Plant Asparagus Crowns
Timing matters when you grow asparagus crowns, so let’s talk about the best window.
1. Plant in Early Spring While Dormant
The ideal time to grow asparagus crowns is early spring, as soon as the soil can be worked.
Planting while the crowns are still dormant lets them wake up naturally in their new home.
In milder climates, late fall planting also works, but spring is safer in most regions.
2. Dig Trenches About 6 to 8 Inches Deep
To grow asparagus crowns properly, dig trenches roughly 6 to 8 inches deep and 12 inches wide.
Space your rows about 4 to 5 feet apart so the ferny tops have room to spread.
If you’re planting several crowns in a row, leave 12 to 18 inches between each one.
3. Build Small Mounds and Spread the Roots
Inside each trench, form a small mound of soil and set the crown on top.
Drape the roots down and outward over the mound like tentacles, which encourages them to grow downward.
This step is why so many people succeed when they learn how to grow asparagus crowns the right way.
4. Cover Gradually as Shoots Emerge
Backfill with just 2 inches of soil at first, then keep adding soil as the shoots grow.
By the end of the first season, the trench should be completely filled and level with the ground.
This gradual covering is a key trick when you grow asparagus crowns in heavy or cool soil.
Caring for Asparagus Crowns After Planting
Once your crowns are in the ground, the work shifts to patience and steady care.
1. Water Consistently but Never Soggy
Give your asparagus crowns about an inch of water per week, especially during dry spells.
Deep, infrequent watering pushes roots downward, which builds stronger plants over time.
Just avoid waterlogged soil, because crowns sitting in standing water will rot.
2. Mulch to Suppress Weeds and Retain Moisture
Spread 2 to 3 inches of straw, compost, or grass clippings around your plants.
Mulch keeps weeds down and holds moisture, which helps asparagus crowns thrive with less effort.
Just keep mulch a couple of inches away from the stems to prevent rot.
3. Feed Them Well Each Spring
Top-dress with compost or a balanced organic fertilizer every spring before growth starts.
Well-fed asparagus crowns produce thicker spears and healthier fern growth.
Avoid high-nitrogen fertilizers later in the season, since they push tender growth that winter will kill.
4. Resist Harvesting Too Early
This is the hardest part of learning how to grow asparagus crowns: you must wait.
Don’t harvest any spears the first year, and only take a light harvest the second.
By the third year, your asparagus crowns are established enough for a full six to eight week harvest.
So, How Do You Grow Asparagus Crowns?
You grow asparagus crowns by planting dormant one-year-old roots in deep, rich, well-drained soil in early spring.
Patience is the real secret, because you grow asparagus crowns for the long haul, not for an instant harvest.
Give them sun, steady moisture, mulch, and a few years to settle in, and you’ll be picking fresh spears for the next two decades.