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9 Steps for Growing Big Garlic!

Garlic is one of the easiest veggies to grow, but sometimes those big green tops yield a harvest of disappointingly small heads. After nearly a year of growing garlic from cloves by patiently watering, weeding and fertilizing, you'll want large flavorful garlic for your favorite recipes!

Here’s 9 steps to take, from pre-planting preparation through harvest, to help you grow your biggest garlic heads yet. In addition to following all of the garlic growing steps outlined below, it is important to plant your garlic at the right time.

Best Time to Plant Garlic

Plant garlic in the fall (September and October are best.) It should be at least 2 weeks before your first frost of the season. This affords your garlic the best possible chances to withstand winter conditions by giving it ample time to establish. November is late to plant garlic, December is marginal.

How to Grow Garlic 

1. Select the best variety for your region

Not all seed garlic grows equally well everywhere. Most seed garlic requires sufficient cold temperatures in winter to develop good heads in spring, but some varieties are more tolerant of warm weather. 

Hardneck garlic needs exposure to 40-50°F for 6 to 12 weeks for the biggest heads. Softneck garlic such as California Early White and California Late White are a good choice for warm climates. 

If you live in an area with warm winters, avoid garlic described as “great for cold areas.” Growing garlic varieties that are not adapted to your climate can result in smaller heads.

2. Prepare the soil for planting

Garlic tolerates a wide variety of soils, but for large heads it is important to prepare your garden with the optimum nutrients and conditions before planting.

Garlic prefers:

  • Loose, loamy soil with high organic matter content
  • Soil with good drainage. Boggy or heavy wet soils can cause cloves to rot or develop poorly.
  • If your garden soil is not suitable for garlic, consider growing it in a raised bed for better drainage.
  • If you fertilize your garden, only do so between pre-planting time and late spring when scapes begin to form. Otherwise you could encourage too much top growth instead of head development.
  • Be careful also of over-fertilizing with nitrogen-rich fertilizers in the fall, this could lead to stimulating top growth and result in frost damage in very cold winter areas. For details on soil preparation for garlic, see our Garlic Planting and Growing Guide.
planting garlic cloves

3. Plant the biggest cloves

The biggest garlic heads grow from the biggest garlic cloves. Large garlic cloves have more energy stored up to help get your garlic off to a good start, and are more resistant to frost damage. When separating cloves for planting, select the largest cloves for growing garlic heads, and use the smaller ones for growing spring green garlic. Just harvest in spring when the leaves have grown, and use like garlic chives.

If you saved some of your harvested garlic for planting, select the larger of your heads for seed garlic and eat the smaller heads. While the larger ones are more appetizing, if you select larger heads for planting this year, you’ll have more big heads for both planting and eating in future years.

4. Give them room to grow

Plant your garlic with plenty of room for their roots to grow, and to keep the garlic from competing with each other for nutrients and water. Spacing them at 6 inches when planting is best. This also is close enough for them to provide some shade to each other while growing, which also helps with the next step.

5. Keep growing garlic cool

The biggest garlic experiences a long cool winter and early spring when it establishes its root system and prepares for head development, followed by a long (but not too hot) spring and early summer growth period when the heads grow and divide. Head growth starts when the soil temperature is around 60° F, and ends when the soil reaches 90° F.

The key to this step is to keep your garlic’s soil cool for as long as possible until it is ready for harvest. This will give it the longest time possible to develop large heads. If your soil gets too hot too early, head growth will stop when they are still small.

How to Keep Your Garlic Cool in the Summer

  • Select a planting site that is shaded during the hottest part of the day.
  • Mulch deeply with light colored material such as straw to help reflect light, insulate the soil from heat, and retain moisture – all of which keep the soil temperature lower.
  • In areas where the ground freezes, mulching also protects the garlic from getting too cold. Compost, or Mega Mulch are also good mulch options.
  • You can also shade your garlic patch with shade fabric.

6. Plenty of water

A good irrigation plan will also help to increase head size. Mulching helps to reduce evaporation, so your soil stays moist longer and less water needs to be applied. Water your seed garlic deeply but infrequently (allow the surface to dry out between watering, but keep it moist several inches down). This will encourage the roots to grow deeper to find water, instead of staying in the upper regions of the soil where the temperature is higher.

7. Weed your garlic beds

Weeds growing among your garlic provide unnecessary competition for nutrients and water. Weed your garden regularly! Mulching can also help to reduce the amount of weeds that sprout up.

Garlic scape

8. Remove scapes right away

Scapes are the flower stalks that hardneck garlic produces in the spring and early summer. Check your growing garlic frequently for these, and remove them at leaf level. They’re good to eat, so don’t throw them out! They should not be allowed to grow because this takes energy away from head growth.

9. Harvest at the right time

Make sure that your garlic is fully grown before harvesting. When your garlic is ready, it will not grow anymore and is considered mature when the tops are a third (the 4 bottom leaves) brown or when it falls over (for softneck varieties).

When your garlic tops begin to yellow, stop watering them. Harvest garlic 2 weeks later and cure them. Don’t wait too long, or the papery covering will start to break down and they won’t store as well. Your garlic will not all be ready at the same time, so harvest each head as needed.

50 comments

  • Tony, the best time to grow garlic is to plant it in the fall and allow it to grow over the winter and harvest the following summer. You probably should grow a softneck garlic. They do best in mild winter areas.

    Suzanne at GrowOrganic.com
  • When is the best time of the year to grow garlic in southern California? I live in the inland impire.
    Thanks

    Tony
  • I grow both type try to get at least a 50/50 chance of a good crop
    they both did good till the warm snaps in winter got them to take off than the freeze took them out then nothing came back.

    leon
  • Leon, what variety are you growing, hardneck or softneck? The hardneck varieties need the cold weather to grow, whereas, softneck varieties are better for milder winter climates. One thing you can do is mulch the garlic with a thick layer of straw. That should keep the garlic from freezing in the ground. Then come spring when the weather starts to heat up, remove some of the mulch.

    Suzanne at GrowOrganic.com
  • lost two crops of garlic due to warm winter weather and they started to grow fast than it froze again for 3 cycles can you plant in early spring to avoid the frosts

    leon
  • Ly. Not sure why you would need to protect them from the rain but if the garlic starts to come up, it cannot push through the ground cover. I would remove it so when they do sprout and come up, they won’t be restricted by the covering. Garlic does need good drainage, so hopefully you are providing that, otherwise they can rot in the ground. My garlic came up in about two weeks so you may want to remove the cover.

    Suzanne at GrowOrganic.com
  • Good information!
    Question: We covered our garlic with a somewhat permeable ground cover over last several weeks because we’ve had so much rain. Are we smothering them? I figured if they are a bulb, then they should be ok for a while until rain subsides and we can then mulch them.

    Ly.
  • Question: Since not all the garlic is ready to harvest at the same time, do I stop watering it all at the same time? This was a problem for me in the past. I kept watering dor the ones that weren’t yellowing and it ruined the others.

    Susan
  • Susan, I would stop watering the entire row. The ones that are not yet yellowing are probably not far behind.

    Suzanne at GrowOrganic.com
  • I live in Arizona and tried the California Late White in my garden this last year. It did pretty well, but was still outperformed by another silverskin type, Western Rose. The Western Rose not only got bigger, but has tighter, thicker wrappers. I wish you carried Western Rose. I only see it carried by one seed company and they are pretty expensive. But by growing the California Late White this year as well, I will be able to save more of my Western Rose for planting.

    You should look into carrying that variety.

    Kayo
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