How Deep Do Asparagus Roots Grow? (Deep Dive)

Asparagus is planted in spring. Most people who ask the question ‘how deep do asparagus roots grow’, do so because they want to know how to space them and whether they have enough space to fit the asparagus plants.

So how deep do asparagus roots grow? Asparagus roots can reach depths between 10 to 15 feet and some 5 to 6 feet wide in diameter, according to the University of New Hampshire.

Asparagus roots grow very deep because they can survive very long in the soil. Certified disease-free asparagus crowns stay in the ground for some 20+ years.

On average, you won’t find asparagus roots growing less than 6 to 8 inches.

The ability of asparagus to survive has led to them being referred to as perennial weeds.

Because they get so deeply rooted, proper care should be taken to reduce the chances of overtaking your local flora.

Asparagus growth should be checked. Any excesses should be removed.

How Deep Should Soil Be For Asparagus To Grow?

For optimal root development, asparagus requires a planting depth of at least 16 feet (or 5 meters).

Plant the crown of the asparagus root 6 inches (15 cm) deep when you first set them in the ground.

how deep do asparagus roots grow in soil
Planting asparagus

Asparagus is easy to grow from seed and only requires a little layer of soil to get going.

Nonetheless, after it reaches a height of 6 inches, it will have to be transferred. To support a tree that tall, the soil depth needs to be at least 6 inches.

Inadequate crown development and reduced spear production can result from asparagus being planted too shallow. Because of this, harvests of asparagus will be reduced.

Asparagus beds need a lot of solid depth and irrigation to keep the soil moist enough to keep producing.

When the time comes to gather your asparagus spears, you’ll have enough thanks to this method. Keep reading.

So, asparagus can be started in containers, but after it reaches about 6 inches (15 cm) in height, it needs to be moved outside.

They need a depth of at least 16 feet (five meters) to mature. Although possible, asparagus is not a good candidate for container gardening.

How To Care For Asparagus Roots During Weeding

Asparagus plants have a dense network of roots under the soil. They spread their roots wide and deep.

Weeding using long sharp tools is a challenge. Such tools can easily damage the roots.

The challenge of weeding asparagus makes it a good practice to try and reduce the threat of weeds at the early planting stages.

Once weeds grow around the asparagus, it becomes difficult to remove them without damaging the crop.

Set a perimeter path or clearing to keep weeds from creeping. Grasses are a notorious weed.

Left alone, they compete with asparagus for nutrients. The result is weak plants and a poor harvest.

Deep-rooted asparagus break down the hard pan soil layer making the soil soft and easy to penetrate for weak-rooted crops.

Read Also: What Does Wild Asparagus Look Like And Can You Transplant Them?

How Deep To Plant Asparagus Crowns

A shallow trench or furrow is ideal for planting asparagus crowns. How deep you sow your seeds will vary with the soil.

In sandy, light soils, plant asparagus crowns 6 to 8 inches deep; in heavier soils, plant them just 4 inches deep.

You should put the crowns at a distance of 12-18 inches in rows that are 4-5 feet apart. The buds should be facing upward as the roots are spread out in the trench.

Before planting, amend the soil in the trench with a little manure. After the plants are in place, backfill the trench to its full depth.

There’s no need to backfill the furrow as the plants mature like in the old days.

When compared to traditional asparagus, male hybrid types have greater yields and greater longevity.

Jersey Giant, Jersey Knight, and Jersey King are three male asparagus types that might thrive in Iowa. In Iowa, for example, the best time to grow an asparagus bed is early spring (April).

Given that asparagus is a perennial crop, take some time to consider locations for the asparagus garden.

Well-drained soils and sunlight are the perfect conditions to support optimum asparagus growth.

You can import soil into a raised bed if the soil in your area is well-drained.

Because asparagus need lots of light, do not grow under the shade of large trees or structures.

You can cultivate asparagus from seeds. However, most farmers grow one-year-old asparagus plants and crowns to ensure the success of the crop.


Asparagus has deep roots They could go more the 10 to 15 feet deep. Make sure you keep the area free of weeds from the beginning. Otherwise, you’ll have a problem getting rid of the weeds later.


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