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Steps to Growing Asparagus from Seed to Harvest in Your Home Garden

Published on
May 24, 2024
Steps to Growing Asparagus from Seed to Harvest in Your Home Garden
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Are green onions and scallions the same thing?

Yes, green onions and scallions refer to the same vegetable. The terms are used interchangeably in different regions.

Can I regrow green onions from kitchen scraps?

Yes, you can regrow green onions from kitchen scraps. Place the white bulb ends with roots in a glass of water, ensuring the roots are submerged. Change the water regularly, and new growth will emerge from the top.

How do I prevent my green onions from bolting?

Bolting occurs when green onions prematurely produce a flower stalk. To prevent bolting, avoid planting them during the hottest part of the year and keep the soil consistently moist.

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Steps to Growing Asparagus from Seed to Harvest in Your Home Garden

asparagus growing in soil

As a gardener, I've always been fascinated by the idea of nurturing a plant from the tiniest seed to a full-grown, productive plant. Out of all my gardening endeavors, I have to say that growing asparagus from seeds has been one of the most rewarding challenges I've undertaken because it's an adventure in patience and dedication.

If you're thinking about giving it a shot, trust me, you'll need a healthy dose of patience, but believe me when I say it's totally worth it. Here's a detailed, beginner-friendly guide based on my personal experience, to help you get started on your own asparagus journey.

Understanding Asparagus Plant Basics

Asparagus is a delicious and nutritious vegetable that can be grown easily from seeds. In this section, I will cover some basics about asparagus plants that you need to know before starting your own asparagus garden.

Asparagus Plant Lifecycle

infographics on asparagus life cycle

Growing asparagus takes a bit of patience, but it's totally worth it in the end. These plants have a long lifecycle, and it takes about three years from seed to harvest. The good news is they're perennial, so once they’re established, they’ll keep coming back year after year.

In the first year, you'll just see some feathery foliage. In the second year, the stems will be thicker, but resist the urge to harvest them just yet. By the third year, you’ll finally get those thick, juicy spears that are ready to be picked.

Asparagus plants can live up to 20 years, so it’s important to pick a good spot for them. They love well-drained soil and lots of sunshine. Plant them in the right place and you'll be enjoying fresh asparagus for many years to come.

Varieties of Asparagus

infographics common asparagus varieties

There are quite a few varieties of asparagus to choose from, but the most common ones are green, white, and purple asparagus. Green asparagus is the most familiar and the one you’ll typically find at the grocery store. White asparagus is grown underground, which gives it a milder flavor compared to the green variety. Then there’s purple asparagus, which is a bit sweeter and has a higher sugar content than the green kind.

When deciding which variety to grow, think about your personal taste preferences and the climate in your area. Some types of asparagus do better in cooler climates, while others thrive in warmer weather. Picking the right variety for your taste and growing conditions will make your asparagus-growing experience even more enjoyable.

Starting Indoors vs. Direct Sowing

When it comes to planting from seeds, you have two options: starting indoors or direct sowing. Each method has its advantages and disadvantages, and it's up to you to decide which one is best for you.

Starting Indoors

Starting asparagus seeds indoors is a great way to give yourself more control over the growing conditions and get a head start on the season. You can begin the process in late winter or early spring, and then transplant the seedlings outdoors once the weather warms up.

Once the seedlings have grown to about 6 inches tall, they're ready to be moved. You can transplant them into individual pots or directly into your garden. This early start helps ensure your asparagus gets off to a strong and healthy beginning, setting the stage for a bountiful harvest in the future.

Direct Sowing

Direct sowing is a simpler and more natural method, but it requires more patience. You'll need to wait until the soil has warmed up in the spring before you can sow the seeds directly into the ground. So, direct sowing is best for those who are willing to wait a bit longer for their asparagus to grow.

This method allows the seeds to adapt to the natural outdoor conditions from the start, and it can be less labor-intensive since you don't have to transplant seedlings later. If you don’t mind the wait and enjoy the simplicity, direct sowing might be the way to go for you.

Step-by-Step Process of Growing Asparagus from Seeds

Step 1: Choosing the Right Seeds

a tool with a number of asparagus seeds

The first step is selecting the right seeds. I opted for the Mary Washington variety, known for its productivity and disease resistance. Other good choices include Jersey Giant and Purple Passion.

Look for seeds that are plump, firm, and free from damage or discoloration. It is best to purchase seeds from a reputable supplier or to save seeds from a healthy asparagus plant that you know produces good quality spears.

Step 2: Preparing the Seeds

soaking asparagus seeds in a plastic container

Once you have selected your seeds, the next step is to soak them in water for 24-48 hours. This helps to soften the seed coat and kick-starts the germination process.

Step 3: Preparing the Soil

preparing soil with tray, container, and trowel

While you’re waiting for your seeds to soak, take some time to prep your soil. In your container, toss in some compost or well-rotted manure to boost the soil structure and give your plants the nutrients they’ll need to thrive.

If you’re going the direct sowing route, make sure the soil is clear of weeds and debris. Since asparagus grows pretty slowly, weeds can quickly take over. Just clear out any weeds or debris from the planting area before you get started. This will give your asparagus the best shot at growing strong and healthy.

Step 4: Planting the Seeds

hand planting seeds

Fill your seed trays or containers with some high-quality seed-starting mix or the soil you prepped earlier. Use a pencil to make small indentations about 1 inch deep, and pop one seed into each spot. Cover the seeds lightly with soil and give them a gentle pat down.

When planting asparagus seeds, it's important to get the depth and spacing right. Plant the seeds about 1 inch deep and space them around 2 inches apart. You can go for rows or a grid pattern, whatever feels easiest. This setup will give your seedlings plenty of room to grow strong and healthy.

Don't forget to water them after. Keeping the soil moist but not waterlogged is crucial. I used a spray bottle to mist the surface, ensuring even moisture without disturbing the seeds.

Step 5: Germination

germination of seeds in pots

This plant needs to be kept moist and warm, but not too hot. The ideal temperature for germination is between 70°F and 58°F. To keep the seeds moist, I covered the trays with plastic wrap, this will help to create a humid environment that will promote germination. And don't forget to give the soil a spritz every day or two to keep it moist.

Now, germination's not going to happen overnight. It's going to take a chill 2-3 weeks, so kick back and let nature do its thing.

Once those little seedlings start popping up, peel off that plastic wrap and give them some sunshine.

Step 5: Place on a Sunny Location

asparagus plant placed by a window

Speaking of sunshine, asparagus need at least 6-8 hours of direct sunlight daily to grow robustly and produce high-quality spears. So, choose a sunny spot indoors where the plants will receive uninterrupted sunlight. If you're direct sowing, make sure there are no large trees or structures casting shade over your asparagus bed.

Step 6: Transplanting the Seedlings

transplanting seeds outdoors with containers and pots

So, when your asparagus seedlings hit around 8-10 weeks old, that's your cue for the big move. By then, they've got some sturdy roots and a few leaf sets. It is important to transplant them before they become too crowded in their containers, which can lead to stunted growth.

Transplanting's pretty straightforward. Get your planting spot ready by prepping up the soil with some compost or manure to give those babies a nice, cushy bed.

Now, when you're ready to plant, dig a hole deep enough to snugly fit the seedling's whole root system. Gently coax the seedling out of its container, making sure not to rough up those precious roots. Pop it into the hole, spread those roots out nicely, and fill them up with soil. Just make sure the crown of the seedling is level with the soil surface.

Water them to help settle everything in, but don't drown them. And for the next few weeks, keep that soil just moist enough – not too soggy, not too dry. Mulching around the plants can help to retain moisture and suppress weeds

Step 7: Maintenance

maintenance on plants on soil with a container

It is important to note that asparagus is a slow-growing plant that takes about 2-3 years to mature. During this time, it is important to provide adequate care and maintenance to ensure healthy growth and yield. With proper care and attention, you can successfully grow asparagus from seeds and enjoy a bountiful harvest.

Watering

1. Consistent Moisture: Asparagus plants need consistent moisture, especially during the first few years of growth when they are establishing their root systems. I aimed to keep the soil evenly moist but not waterlogged.

  • Seedlings and Young Plants: Water young asparagus plants regularly to ensure they do not dry out. During the first growing season, I watered them deeply once a week, increasing frequency during hot, dry spells.
  • Established Plants: For established asparagus beds, deep watering once a week is usually sufficient. I found that applying about 1 to 2 inches of water per week was ideal, depending on rainfall.

2. Mulching: Mulching around the base of the plants helps retain soil moisture and reduce the frequency of watering. I used organic mulches like straw or wood chips to achieve this.

Fertilizing

Regular fertilization helps maintain soil fertility and promotes vigorous growth. In early spring, I applied a balanced fertilizer and supplemented with compost after the harvesting season.

Weed Management

Weeds can compete with asparagus for nutrients, water, and sunlight, leading to reduced growth and yield. To manage weeds, it is important to keep the garden free of weeds by using mulch or hand weeding. You can also use pre-emergent herbicides to prevent weed growth.

Thinning Seedlings

Asparagus seedlings can grow quite close together, which can lead to competition for nutrients and stunted growth. To prevent this, it's important to thin out the seedlings.

I usually wait until the seedlings have grown to about 2 inches tall before thinning them out. I gently pull out the weaker seedlings, leaving only the strongest ones. This helps ensure that each seedling has enough space to grow and develop properly.

How I do it:

First Year Care

The first year is all about establishing strong root systems, so patience and care are crucial. Here’s how I tended to my young asparagus plants:

  • Watering: I kept the soil consistently moist, especially during dry spells. Young asparagus plants need regular watering to establish deep roots.
  • Mulching: To conserve moisture and suppress weeds, I applied a layer of mulch around the plants. Straw, leaves, or grass clippings work well.
  • Fertilizing: Every few weeks, I applied a balanced fertilizer to support vigorous growth. Organic options like compost tea or fish emulsion are excellent choices.

It’s essential not to harvest any spears during the first year. Allowing the plants to grow and develop their foliage helps build a strong root system that will support future harvests.

Year 2 and Beyond: Nurturing Your Asparagus

Starting from the second year, the plants will begin to show more vigor. Here’s how I continued to care for them:

  1. Watering: Regular watering is still important, especially during dry periods. Consistent moisture helps the plants grow strong and healthy.
  2. Weeding: Keeping the bed weed-free is essential to prevent competition for nutrients. Mulching helps, but I also hand-weeded around the plants as needed.
  3. Fertilizing: In early spring, I applied a balanced fertilizer to give the plants a boost as they emerged from dormancy. After the harvesting season, I added compost to replenish soil nutrients.

Fall Care

In the fall, after the foliage turned yellow and died back, I cut it down to soil level. This helps prevent diseases and prepares the plants for winter dormancy. I also applied a layer of compost or mulch to protect the crowns from harsh winter conditions.

Step 8: Harvesting

a bunch of harvested asparagus

Once your asparagus plants have matured and are ready for harvesting, there are a few things to keep in mind to ensure a successful harvest. Here are some tips:

Timing

The first thing to consider is timing. Asparagus can take up to three years to reach maturity from seed, so it's important to wait until the plants are at least three years old before harvesting. This will ensure that the plants have had enough time to establish strong root systems and produce healthy spears.

Technique

To harvest, simply snap off the spears at ground level using your fingers. This will help to prevent damage to the crown of the plant, which can lead to disease and reduced yields.

Frequency

Asparagus spears grow quickly, so it's important to harvest them frequently to prevent them from becoming tough and woody. Aim to harvest every two to three days during the peak growing season, which is typically in the spring.

Storage

Once harvested, asparagus can be stored in the refrigerator for up to a week. To keep the spears fresh, wrap them in a damp paper towel and store them in a plastic bag.

Pest and Disease Management

Asparagus can be affected by pests and diseases, but with proper care, these can be managed effectively. Here are ways to handle common issues:

Common Pests

  1. Asparagus Beetles: These pests can defoliate plants and damage spears. I handpicked beetles and larvae whenever I spotted them. In severe infestations, I used insecticidal soap.
  2. Cutworms: These larvae can sever seedlings at the soil level. You can use collars around young plants and encourage natural predators like birds to keep cutworm populations in check.

Common Diseases

  1. Fusarium Wilt: This soil-borne fungus can cause plants to wilt and die. To prevent it, I practiced crop rotation and avoided planting asparagus in the same spot for at least 15 years.
  2. Rust: This fungal disease causes orange spots on leaves. Planting resistant varieties and ensuring good air circulation by proper spacing helped minimize its impact.

Organic Control Methods

  1. Neem Oil: Effective against many pests and fungal diseases, I used neem oil as a natural pesticide.
  2. Beneficial Insects: Ladybugs and lacewings are great allies in controlling aphids and other pests.
  3. Companion Planting: I planted marigolds nearby to repel nematodes and attract beneficial insects.

FAQs

Q: Can I grow asparagus in containers?

A: Yes, you can! Asparagus can be grown in containers, but keep in mind that they have deep root systems, so choose a container that is at least 18 inches deep. Make sure the container has good drainage, and use a well-draining potting mix. Additionally, consider planting only one or two crowns per container to allow enough space for root development.

Q: Can I divide mature asparagus plants?

A: Yes, mature asparagus plants can be divided to create new plants. Dividing is typically done in early spring before new growth begins. Carefully dig up the crowns and use a sharp knife to divide them into sections, making sure each section has both roots and shoots. Replant the divisions in well-prepared soil.

Q: How do I prepare asparagus for planting if I live in a region with cold winters?

A: In regions with cold winters, it's essential to prepare asparagus crowns for planting by providing adequate protection from freezing temperatures. One method is to plant crowns in trenches and gradually fill them in with soil as the weather warms up. Alternatively, you can start crowns indoors in pots and transplant them outdoors once the threat of frost has passed.