How Do You Grow White Asparagus

You can grow white asparagus by planting asparagus crowns and then hilling soil over the spears as they emerge.
 
This process, called blanching, blocks sunlight from reaching the growing shoots.
 
Without sunlight, the spears never produce chlorophyll, which is what keeps them pale and mild instead of green and grassy.
 
If you’ve ever asked yourself how do you grow white asparagus, the short answer is that you grow it exactly like green asparagus with one crucial extra step.
 
The difference isn’t the seed or the plant itself, it’s all about light deprivation.
 
In this post, we’ll walk through how do you grow white asparagus from crowns to harvest, the soil prep it needs, and the mistakes that turn your spears green.
 
Let’s dig in.
 

How Do You Grow White Asparagus: The Basics

Growing white asparagus starts with understanding that it’s the same plant as green asparagus.
 
The only difference is that white asparagus spears are never exposed to sunlight.
 
So when you grow white asparagus, you’re really just growing asparagus in the dark, under a blanket of soil.
 
Here’s why that works.
 

1. It All Comes Down to Chlorophyll

When asparagus spears break through the soil and hit sunlight, they produce chlorophyll.
 
Chlorophyll turns them green and gives them that slightly bitter, grassy flavor.
 
To grow white asparagus, you simply keep the spears buried so photosynthesis never kicks in.
 
That’s why white asparagus stays tender, pale, and subtly sweet.
 

2. You Start With Crowns, Not Seeds

Most people who grow white asparagus begin with one-year-old crowns.
 
Crowns establish faster and give you a harvest a full year sooner than seeds.
 
If you plant seeds, expect to wait three years before you grow white asparagus you can actually eat.
 
For a quicker payoff, crowns are the way to go.
 

3. It’s a Long-Term Commitment

An asparagus bed can produce for 15 to 20 years when it’s cared for properly.
 
So when you grow white asparagus, you’re planting a perennial crop, not a one-season wonder.
 
Pick your spot carefully because those roots don’t like being disturbed.
 

How to Grow White Asparagus Step by Step

Now that you understand the concept, here’s how do you grow white asparagus in practice.
 
Follow these steps and you’ll be harvesting pale spears before you know it.
 

1. Prepare Deep, Loose Soil

White asparagus needs loose, sandy loam that drains well.
 
Dig a trench about 12 inches deep and work in plenty of compost.
 
Good drainage matters because soggy roots rot fast, and hilling soil around the spears adds even more weight on top.
 

2. Plant the Crowns Correctly

Set crowns about 18 inches apart in the bottom of your trench.
 
Spread the roots out like a spider and cover them with just two inches of soil at first.
 
As shoots appear, gradually fill the trench back in over the season.
 

3. Hill Soil Over Emerging Spears

This is the step that makes white asparagus white.
 
Once your beds are established, mound soil over the rows as soon as spears start poking through.
 
Keep mounding until the tip is covered by a few inches of dirt, and check daily during harvest season.
 

4. Harvest at the Right Moment

To grow white asparagus properly, cut spears when they’re six to eight inches long.
 
Use a sharp knife and cut just below the soil surface.
 
Then gently fill the hole back in so the next spears stay covered.
 

Common Mistakes When You Grow White Asparagus

Even seasoned gardeners trip up when they grow white asparagus.
 
Here are the pitfalls to sidestep.
 

1. Letting Sunlight Sneak In

The number one mistake is exposing the tips, which turns them green or purple.
 
If you grow white asparagus, check your mounds every single morning during harvest.
 
A spear can break the surface in a matter of hours.
 

2. Harvesting Too Soon or Too Long

Don’t harvest at all the first year, and only lightly the second.
 
When you do grow white asparagus for real, stop cutting after about six to eight weeks.
 
That rest period lets the fern grow and store energy for next season.
 

3. Using Heavy Clay Soil

Clay soil compacts and holds water, which is a death sentence for asparagus roots.
 
If your ground is heavy, build raised beds so you can still grow white asparagus successfully.
 

4. Skimping on Patience

White asparagus rewards gardeners who wait.
 
Give the bed a full year to establish before you harvest anything substantial.
 
 

So, How Do You Grow White Asparagus?

You grow white asparagus by planting crowns in deep, loose soil and hilling dirt over the spears to block out every bit of light.
 
That simple act of blanching is what keeps them pale, tender, and sweet instead of green and grassy.
 
When you grow white asparagus, patience and daily attention during harvest are your two best tools.
 
Get those right and you’ll enjoy gourmet-quality spears straight from your own garden for years.