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How to Prepare Soil for Growing Garlic

in Fall Garden· Gardening Tips & How-to's· In the Garden· The Beginner's Garden Podcast· Vegetables

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Are you preparing your garlic beds for planting? What is the best way to ensure your garlic grows to its full potential next summer?

Garlic is so easy to grow and definitely the most hands-off crop. Once you learn the basics of growing garlic and you see how easy it is, garlic will become a staple in your fall garden plans.

I’ve been growing garlic for the past six or seven years; however, my 2020 harvest was the best I’ve ever had!

great garlic harvest

*links below may contain affiliate links, which means if you click through and make a purchase, this blog will earn a commission at no extra cost to you.

I wish I could tell you that I have the precise formula for what resulted in such a generous crop this season, but as most seasoned gardeners know, there are no promises when it comes to gardening. Sometimes it’s hard to tell if a great harvest is the result of luck, Mother Nature’s favor, or something specific you do. But in this case, I have to believe how I prepared my soil differently definitely had an impact on the results.

When to Plant Fall Garlic

The most important first step in preparing for a bumper garlic harvest is to plant your garlic at the correct time.

I plant garlic around my first fall frost date. Typically, I’ll have a frost-tender crop coming out around this time, and it’s perfect to replace those crops with garlic. This, for me, is peppers, zucchini, cucumbers, or tomatoes.

Some gardeners plant garlic before the average first frost date, and some plant after. The good news is that garlic is pretty forgiving when it comes to the timing. The goal is to get it in the ground while the ground is still fairly warm so its roots can establish before the cold sets in.

Learn more about when to plant garlic.

garlic bulbs after harvest

Preparing the Soil for Garlic

The most important considerations for soil when it comes to planting garlic are soil structure and soil fertility. With soil structure, you want to make sure your soil isn’t too heavy (clay) or too light (sand). Retaining water and nutrients without the soil becoming water-logged is important. With this in mind, these are the steps I took to prepare my soil before I planted in the fall:

Incorporate organic matter

The first thing I did over the summer before planting to prepare my soil was a bit of an accident. The plants that were growing where I planted my garlic were mostly root crops (carrots, radishes, and arugula). I had grown arugula in the early spring and then it went to flower.

After this arugula flowered, I ‘chopped and dropped’ it into the soil. To chop and drop means to cut these plants at soil level, take your garden hoe, and literally chop these plants into the soil. This organic matter returned into the soil replenished nutrients and soil structure.

chop and drop to prepare for planting

As mentioned, this step was more of an accident, so you may not be able to do this at planting (unless you have a spent crop ready to go).

But I mention it because anytime you can let spent (non-diseased) plants compost into the soil in which they grew, this helps the overall soil health. And I believe this did play a role in preparing my soil for garlic planting.

Add Compost

I mulched this area over the summer with bulk (weed-free) compost from my local landscaping company. I usually mulch with wood chips, but I chose compost because it was easier to add around the smaller plants I had in this bed. This compost broke down so well and I was shocked to feel the difference in my soil texture when I went to prepare my soil for garlic planting.

If you have not added compost in some form, definitely add it at planting time for your garlic. Compost adds nutrients, improves soil structure, retains moisture, and helps with long-term fertility of the soil.

Add organic nitrogen

It’s important to have nitrogen in your soil in order to form stems on plants like garlic and onions. As plants grow and get large and leafy, those stems feed your bulb.

A great organic source of nitrogen for your garden soil is chicken manure, and since we have chickens, I’m never in short supply. Another organic source of nitrogen is blood meal.

chickens in the garden for organic nitrogen
Pictured are a few of my chickens that provide organic nitrogen (via their manure), eat garden pests and insects and produce eggs for our family.

Add organic fertilizer (maybe)

This year I decided to add organic fertilizer in addition to compost. Options include nutrient-specific fertilizers or an organic all-purpose fertilizer.

In addition to the nitrogen mentioned above, one nutrient-specific option is an organic phosphorus source like rock phosphate. Garlic and root crops flourish with adequate amounts of phosphorus.

However, most garden soil is not lacking in phosphorous and every recent soil test I’ve ever taken has also confirmed that. We don’t want too much phosphorous in excess as it sheds and it’s not good for our water supply and the environment in the long term.

do recommend getting a soil test prior to adding any phosphorus to your soil. You can contact your local cooperative extension agency or use a quick and easy service like free garden printables

Another option is a potassium-based fertilizer. I used wood ash from my fireplace. Be careful, though, because wood ash can raise the pH of your soil. I knew my soil was slightly acidic, which was why I added it. If you’re unsure, another option is greensand. Again, I recommend a soil test to be sure your soil needs potassium and to learn the appropriate application rate.

If you haven’t done a soil test or just want to focus on general fertility, adding an all-purpose granular organic fertilizer is a great option. Its slow-release capability will enable it to continue to feed your garlic for the many months it will be in the ground.

Spacing and Planting Garlic Cloves

Another thing I changed this year was the spacing of my garlic cloves (which is what you plant when you grow garlic).

In the past, I’ve planted my garlic closer together, roughly 4 inches apart. This year, I planted my garlic cloves 6-8 inches apart.

planting garlic cloves in soil

Before planting, you’ll want to dig a trench for each row of garlic a few inches deep and then plant the garlic cloves pointy side up. Then, cover your cloves back up with the dirt.

Soft Neck or Hard Neck Garlic?

Soft neck garlic is what most southern gardeners plant as they do better in areas where it doesn’t get too cold. Hard neck garlic can handle cold winters much better. If you get fairly cold weather in the winter (I’d estimate Zone 5 and below), you probably want to plant hard neck garlic.

I’m zone 7b and in the past, I have planted only soft neck garlic. This year, however, I planted both varieties as an experiment.

soft neck garlic

The results? The soft neck garlic, of which I planted Incheliem Red and Lorz Italian varieties, definitely produced a better harvest than the hard neck garlic. However, the hard neck crop has a stronger flavor and bigger cloves, making it a bit easier to work with in the kitchen. Plus, hard neck garlic produced delicious garlic scapes! (Lovely with roasted asparagus.)

Because I enjoy the storage quality of soft neck and the taste and ease of use of hard neck, both types of garlic have landed a permanent place in my garden.

How Deep to Mulch Garlic?

How much you mulch garlic depends on your winter climate. I had always mulched with a thin layer to protect my plants in years past, but this year I changed.

Because in my zone 7b climate we don’t get super cold in the winter, and our ground doesn’t freeze, I decided to test not mulching over the winter. Garlic requires a cold period to produce its best in the spring.

garlic growing in early spring

If you live in a cooler climate, you’ll want to mulch your garlic beds in preparation for the winter. The colder you are, the more inches you should add, but most places should mulch just a few. Garlic (especially hard neck) is hardy.

Although I didn’t mulch the garlic at planting, I added mulch in the spring to cut down on the weeds. Garlic doesn’t compete well with weeds, so when I saw winter weeds springing up in early February, I added mulch.

mature garlic ready to harvest

Best Way to Prepare Soil for Planting Garlic

Although I had my best garlic harvest using the steps above, I can’t tell you which one (if any, or all) was the golden ticket. In future years I will continue testing, but I do believe there is one principle that will serve you well for garlic growing: organic matter.

The more compost and organic matter you can incorporate into the soil, the better.

More Garlic Growing Resources

In addition to the record harvest I talked about above, I also planted a second bed last year that didn’t yield as great of results. I talk more about the principles above and what might have caused the differences between the beds in the full podcast episode below:

And, don’t miss Q and A podcast episode: “Can I plant garlic from the Grocery store?” For more garlic growing and harvesting tips, check out How to Harvest, Cure, and Store Garlic, and Should You Grow Garlic?

Ready to grow your own garlic? Download the Garlic Planting Cheat Sheet below!

Garlic Planting Cheat Sheet

Garlic is the easiest and most rewarding plant you can grow! All you have to know is some basics:

  • WHEN to plant
  • WHAT KIND to plant
  • WHERE to purchase
  • WHERE NOT to purchase
  • The simplest WAY to plant, whether you have a raised bed, a plot of land, or container. This step is SUPER EASY!

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Filed Under: Fall Garden, Gardening Tips & How-to's, In the Garden, The Beginner's Garden Podcast, Vegetables

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Reader Interactions

Comments

  1. Linda M. Oliver Hughes says

    September 18, 2020 at 7:44 am

    Thanks great info.one thing I didnt see addressed, can you plant garlic in the same bed as the previous year?

    Reply
    • Jill says

      September 18, 2020 at 10:23 am

      It’s not really a recommended practice. Although garlic isn’t one that’s known for disease, when you grow the same crop in the same soil, the same nutrients are being taken up by the plant. If you were to amend your soil well, you probably would be fine, but make sure to add more nutrients in the form of compost, organic fertilizers, and organic matter.

      Reply
  2. Linda Jo says

    September 19, 2020 at 12:43 pm

    Could I plant garlic in a raised asparagus bed? Raleigh North Carolina

    Reply
    • Jill says

      September 21, 2020 at 8:59 am

      I would be wary of that. Asparagus and garlic grow at about the same time, and I believe they would compete with each other. The only thing that *might* work is if your asparagus crowns are spaced out well, you may be able to fit a row of garlic between them, assuming perhaps a foot apart each way. Another challenge would be making sure your asparagus is harvested consistently until you harvest your garlic, because once the asparagus fronds begin growing, they would shade out the garlic and would give you trouble with the garlic harvest. This is, of course, assuming that your asparagus bed is old enough to harvest from. If you’re in the second year and aren’t harvesting, I don’t think you would be able to get your garlic out in time. Obviously these are just my assumptions, having grown both but never together.

      Reply
  3. Keller says

    September 19, 2020 at 6:26 pm

    When you “chopped and dropped” your arugula, what kind of tool did you use?

    Reply
    • Jill says

      September 21, 2020 at 8:55 am

      I used my Rogue Hoe. It’s a triangular-shaped sharp tool that allows me to cut them at the soil level and then incorporate them into the top layer of the soil.

      Reply

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I don’t know if I’ll ever get used to harvesti I don’t know if I’ll ever get used to harvesting from my garden in the winter. It snowed today, even! (Okay, just a dusting, and it already melted, but in central Arkansas, any snow is worth celebrating! 😂)
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Although I’ve grown cabbage in the spring before, this is my first time harvesting a fall crop. (My last two attempts were thwarted by hungry rabbits or rogue hens 😡.)
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I have several more plants that I’m hoping to harvest from now that the days are getting longer and maybe the heads will start growing again. And I also have a new crop started in my grow room.
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This fall-planted parsley 🌱 has done really wel This fall-planted parsley 🌱 has done really well in my Greenstalk Vertical planter. I recently harvested the lower leaves and dried them for use in the kitchen. But the rest of the plant is still growing well, and I expect to harvest from it for months to come.
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I’ve spent the better part of two days selecting I’ve spent the better part of two days selecting and ordering seeds for this year. My husband thinks my intensive research is a bit over the top. Maybe.... 🤔
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🌲 The trees on my property are mainly pine trees, so I’ve never had fallen leaves to collect and use as mulch. (That’s mainly why I use wood chips.) But when my dad offered to collect and bag up his leaves and give them to me, of course I said yes!
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