Garlic bulbs grow larger when you remove flower scapes early and provide consistent nitrogen through spring. If you have been searching for how to grow bigger garlic, the answer is not just about planting bigger cloves, though that helps. It is about timing, soil biology, and making the plant focus all its energy on the bulb instead of reproduction.
Most gardeners plant garlic in the fall and forget about it until spring. That is a mistake. The work you do in April and May determines the size of your harvest in July. Let’s break down the exact steps you need to take, from soil prep to harvest day.
Why Garlic Bulbs Stay Small
Small garlic bulbs are almost always a result of one of three problems: competition, stress, or early harvest. When garlic plants get crowded, they compete for water and nutrients. When they get too hot or too dry, they shut down bulb growth. And when you pull them too early, they have not finished sizing up.
But there is another hidden culprit: the flower scape. If you let that curly stem grow tall, the plant pours energy into making seeds. You want that energy going into the bulb. Removing the scape is the single biggest “free” win you can get.
Start With The Right Seed Garlic
You cannot grow jumbo garlic from tiny, grocery-store cloves. Supermarket garlic is often treated with sprout inhibitors and grown for shelf life, not size. You need seed garlic from a local farm or a reputable online supplier.
- Choose hardneck varieties like Music, German Extra Hardy, or Chesnok for large, flavorful bulbs.
- Softneck varieties like California Early are good for braiding but often produce smaller bulbs in cold climates.
- Buy the largest seed cloves you can find. A clove that weighs 10 grams will produce a much bigger bulb than a 4-gram clove.
Do not plant cloves from a grocery store. They are often the wrong variety for your region and may carry disease. Spend the extra dollar per bulb on certified seed garlic. It pays off at harvest.
Soil Preparation Is Non-Negotiable
Garlic loves loose, fertile soil with a pH between 6.5 and 7.0. If your soil is compacted clay or pure sand, you will get small bulbs. You need to fix this before planting, not after.
- Test your soil in late summer. Add lime if pH is below 6.2.
- Work in 2-3 inches of aged compost or well-rotted manure.
- Add a balanced organic fertilizer like 5-5-5 at planting time.
- Rake the bed smooth and remove all rocks and clumps.
Raised beds are ideal for garlic because they drain well and warm up faster in spring. If you garden in heavy clay, build a raised bed at least 8 inches deep. Garlic roots can go down 12 inches or more, so give them room.
Planting Depth And Spacing For Maximum Size
Planting too shallow or too close together is a common reason for small bulbs. Garlic needs space to expand. If cloves are crowded, they will form small, round bulbs with no distinct cloves.
- Plant cloves 6 inches apart in rows that are 12 inches apart.
- Set each clove 2-3 inches deep, measured from the tip of the clove to the soil surface.
- In cold climates, add 2-4 inches of straw mulch after planting to protect against freeze-thaw cycles.
Do not push the cloves into the soil. Dig a hole or use a dibber, place the clove with the pointy end up, and cover it. Pushing can damage the root plate, which slows growth.
Spring Feeding: The Key To Big Bulbs
Garlic is a heavy feeder. It needs a steady supply of nitrogen in early spring to build leafy tops. Those leaves are the solar panels that feed the bulb. If the plant is starved for nitrogen, the leaves stay small and so do the bulbs.
Start feeding as soon as green shoots emerge in late winter or early spring. Use a high-nitrogen organic fertilizer like blood meal, feather meal, or fish emulsion. Apply it again three weeks later, and then a third time in mid-spring.
- First feeding: 1 tablespoon of blood meal per plant, scratched into the soil.
- Second feeding: Liquid fish emulsion diluted per label, applied at the base.
- Third feeding: A balanced fertilizer like 10-10-10, but only if leaves look pale.
Stop all nitrogen feeding by late May. Too much nitrogen late in the season causes soft growth and poor storage. The plant needs to switch from leaf growth to bulb expansion.
Watering Rules For Bigger Garlic
Garlic needs about 1 inch of water per week in spring. But the timing matters more than the total amount. Inconsistent watering causes the bulb to crack or split. It also stresses the plant, which stops growth.
Here is a simple schedule:
- Water deeply once a week if there is no rain.
- Mulch with straw to retain moisture and keep soil cool.
- Stop watering completely 2-3 weeks before harvest.
The dry period before harvest is critical. It tells the plant to stop growing and start curing. If you keep watering, the bulbs will be watery and rot in storage.
Remove Scapes Early For Maximum Bulb Size
This is the step most gardeners skip, and it is the biggest mistake. Hardneck garlic produces a flower stalk called a scape in early summer. If you leave it, the plant wastes energy making flowers and tiny bulbils. Removing it forces the plant to redirect that energy into the bulb.
Cut the scape when it has made one full curl, usually in late May or early June. Do not pull it out, as you can damage the stem. Use scissors or a sharp knife to cut it at the base.
Do not throw the scapes away. They are delicious. Chop them and use them in stir-fries, pesto, or scrambled eggs. They taste like mild garlic and are a bonus crop.
Weed Control And Mulching
Weeds steal water, nutrients, and sunlight from your garlic. A single weed growing next to a garlic plant can reduce bulb size by 20%. You need to stay on top of this.
- Mulch with 4-6 inches of straw in fall. This suppresses winter weeds.
- In spring, pull any weeds that push through the mulch.
- Do not use black plastic; it keeps soil too wet and hot.
If you did not mulch in fall, apply a thin layer of straw after the soil warms in spring. This keeps the soil cool, which garlic prefers for bulb formation.
When To Harvest For Maximum Size
Harvesting at the right time is just as important as planting. If you harvest too early, the bulbs are small and immature. If you harvest too late, the bulbs split and do not store well.
The signs are simple:
- Lower leaves turn brown and dry.
- Upper leaves are still green.
- Bulbs are firm and have fully formed wrappers.
Dig a test bulb first. Cut it open. If the cloves fill the wrapper completely and there is no space between them, it is time to harvest. If the cloves look flat or the wrapper is papery, wait another week.
Use a garden fork to loosen the soil, then pull the bulbs by hand. Do not pull hard or you will break the stems. Gently shake off excess soil, but do not wash the bulbs.
Curing And Storing For Longevity
Curing is the process of drying the bulbs so they store for months. It is not optional. Garlic that is not cured properly will rot in a few weeks.
- Bundle 8-10 plants together and hang them in a dry, shady, well-ventilated area.
- Alternatively, lay them on a screen or wire rack in a single layer.
- Keep them out of direct sunlight to prevent sunburn.
- Allow 3-4 weeks for curing. The skins should be papery and the roots dry.
Once cured, trim the roots and cut the stems to 1 inch above the bulb. Store at 60-65°F with moderate humidity. Do not store in the fridge; it is too humid and causes sprouting.
Common Mistakes That Shrink Your Garlic
Even experienced gardeners make these errors. Avoid them and you will see a big difference in bulb size.
- Planting too late in fall. Garlic needs 4-6 weeks to establish roots before the ground freezes.
- Using fresh manure. It burns roots and introduces pathogens.
- Skipping the scape removal. This is the #1 cause of small hardneck bulbs.
- Overwatering in June. This causes rot and splits.
- Harvesting on a rainy day. Wet bulbs do not cure well.
If you have had small garlic in the past, check your planting date first. Many gardeners plant in November, which is too late for most regions. Aim for 2-3 weeks before the first hard frost, usually mid-October.
How To Grow Bigger Garlic In Containers
If you do not have garden space, you can grow garlic in containers. But you need a deep pot, at least 12 inches, and you must be diligent about feeding. Container garlic dries out fast and needs more frequent watering.
- Use a 5-gallon bucket or a 15-inch diameter pot for 3-4 cloves.
- Fill with a mix of potting soil and compost (50/50).
- Plant cloves 4 inches deep and 6 inches apart.
- Water every 2-3 days in spring, more if it is hot.
- Feed with liquid fertilizer every 2 weeks until late May.
Container garlic will not get as large as in-ground garlic, but it is still better than store-bought. Just do not expect jumbo bulbs from a small pot.
Frequently Asked Questions
Does Bigger Seed Garlic Always Mean Bigger Bulbs?
Yes, to a point. A large clove has more stored energy, so it produces a stronger plant and a bigger bulb. But genetics matter too. Some varieties are naturally small. Choose a variety known for large bulbs, like Music or Kettle River Giant.
Can I Grow Big Garlic From Grocery Store Cloves?
You can, but results are poor. Grocery garlic is often sprayed to prevent sprouting, and it is grown in different climates. It may also carry viruses. Buy seed garlic from a local farm for best results.
Why Are My Garlic Bulbs Splitting?
Splitting happens when you water too much in June or harvest too late. The outer wrapper breaks and the cloves separate. Keep watering consistent, then stop completely 2-3 weeks before harvest.
Should I Remove Scapes From Softneck Garlic?
Softneck garlic rarely produces scapes, so this is not an issue. Only hardneck varieties grow scapes. If your softneck does send up a flower stalk, remove it the same way.
How Much Nitrogen Does Garlic Need?
Garlic needs about 1 pound of actual nitrogen per 100 square feet over the growing season. Split this into three applications in early spring. Too much at once causes leaf burn.
Final Checklist For Jumbo Garlic
Here is your quick reference for next season. Print this out and tape it to your garden shed.
- Order large seed garlic in July, not September.
- Test soil and amend with compost in September.
- Plant cloves 6 inches apart, 2-3 inches deep, in mid-October.
- Mulch heavily with straw after the ground freezes.
- Feed with nitrogen in March, April, and early May.
- Water 1 inch per week, consistently.
- Cut scapes in late May when they curl.
- Stop watering in late June.
- Harvest when lower leaves are brown, usually early July.
- Cure for 3-4 weeks in a dry, shady spot.
Growing large garlic is not luck. It is a series of small, correct actions done at the right time. If you follow these steps, you will go from golf-ball-sized bulbs to baseball-sized ones. The scape removal alone will add 20-30% to your bulb weight. Combine that with proper feeding and spacing, and you will have the biggest garlic in your neighborhood.
One last tip: keep a garden journal. Write down when you planted, when you fed, and when you harvested. Next year, you will know exactly what worked. Garlic is forgiving, but it rewards attention. Give it what it needs, and it will give you a harvest you can brag about.