If you want large, plump garlic bulbs next summer, the most important work happens months before harvest.

Garlic is different from many vegetables because it benefits from spending winter in the ground. Autumn planting gives cloves time to establish roots before winter, and many varieties need a period of cold to trigger good bulb development. The RHS recommends planting most garlic from mid-autumn to early winter for exactly this reason.

Spring planting can work, but fall-planted garlic generally has a longer growing period—and that extra time can translate into stronger plants and larger bulbs.

Here are nine things to do this fall if you want your biggest garlic harvest yet.

1. Choose Proper Seed Garlic

The garlic you plant matters.

Rather than automatically separating a supermarket bulb, buy named varieties from a reputable garden centre, nursery or seed supplier whenever possible. The RHS specifically advises using garlic intended for planting because supermarket bulbs may be poorly adapted to local conditions and can present biosecurity concerns.

You’ll usually encounter two main groups.

Hardneck garlic tends to produce fewer, larger cloves and forms a stiff central flower stalk known as a scape.

Softneck garlic generally produces more cloves, stores longer and doesn’t usually form a scape.

For UK gardens, look for varieties suited to the British climate rather than choosing purely on appearance.

2. Save the Biggest Cloves for Planting

Here’s one of the simplest tricks for producing bigger garlic:

Plant your biggest healthy cloves.

Iowa State University Extension notes that the highest yields are obtained from large cloves planted in autumn.

Think of each clove as the plant’s starting battery.

A large, healthy clove has more stored energy available while roots and leaves are establishing.

Separate the bulb shortly before planting and choose cloves that are:

• Large.
• Firm.
• Undamaged.
• Free from mould or soft spots.

Leave the papery skin intact.

The tiny cloves can still grow, but if bulb size is the goal, reserve your best planting space for the largest ones.

3. Prepare the Soil Before the Cloves Go In

Garlic may be low maintenance, but it doesn’t appreciate poor drainage.

For good bulb development, choose a position with:

• Full sun.
• Fertile soil.
• Plenty of organic matter.
• Excellent drainage.

The RHS recommends improving the soil with well-rotted manure or homemade compost before planting, while avoiding fresh manure.

Heavy, waterlogged soil is particularly troublesome because cloves can rot over winter.

If your soil remains wet for long periods, a raised bed, container or autumn-started modules may be safer than planting directly into saturated ground.

4. Plant Each Clove the Right Way Up

This sounds almost too simple to mention, but orientation matters.

Each clove has:

• A flat basal plate at the bottom where roots develop.
• A pointed tip at the top where the shoot emerges.

Plant with the flat end down and pointed end up.

The RHS advises positioning the tip about 2.5cm beneath the soil surface in typical conditions, although planting depth may vary with soil type and climate.

If planted upside down, garlic can still attempt to grow, but the shoot must curve before reaching the surface.

Give it the easiest possible start.

5. Don’t Crowd the Cloves

If bigger bulbs are your goal, garlic needs room.

The RHS recommends spacing cloves about 15cm apart, with rows around 30cm apart.

Planting more closely can squeeze extra plants into the bed, but each bulb then faces greater competition for:

• Water.
• Nutrients.
• Light.
• Root space.

A slightly lower plant count with larger bulbs may be a better trade-off than dozens of undersized heads.

Mark your rows while planting so you don’t accidentally disturb hidden cloves later.

6. Mulch After Planting

Once your garlic is planted, mulch can make winter considerably easier on the crop.

A layer of straw, chopped leaves or similar organic material can help:

• Moderate soil-temperature swings.
• Reduce weed growth.
• Conserve moisture.
• Protect the soil surface.

University of Minnesota Extension recommends several inches of leaf or straw mulch for fall-planted garlic in colder conditions.

In milder climates, the required depth may be less dramatic.

The important thing is not to turn the bed into a permanently soggy mass. Garlic still needs drainage.

7. Keep Weeds Away in Spring

Garlic’s roots are relatively shallow, so it doesn’t compete particularly well with weeds.

Once growth takes off in spring, keep the bed reasonably clear.

Iowa State Extension recommends shallow cultivation or mulch because deep hoeing can damage garlic’s root system.

This becomes especially important while bulbs are enlarging.

Every large weed growing beside your garlic is competing for the same moisture and nutrients.

Pull weeds while they’re small rather than waiting until they’ve developed substantial roots.

8. Feed and Water While the Plants Are Growing Strongly

Autumn planting gives garlic a head start, but spring growth still needs support.

Garlic is a relatively hungry vegetable. Iowa State recommends preparing fertile soil and providing additional nutrition during spring growth.

The exact feeding programme should depend on your soil and fertiliser product rather than a one-size-fits-all internet recipe.

Water matters too.

Garlic needs adequate moisture while the leaves and bulbs are actively developing, but the soil shouldn’t remain waterlogged.

During prolonged dry spring weather, water deeply enough to reach the root zone.

As harvest approaches and foliage naturally begins dying back, reduce or stop irrigation according to local conditions.

9. Remove Hardneck Scapes

If you’re growing hardneck garlic, an elegant curling stalk may emerge in late spring or early summer.

That’s the scape.

It looks attractive—and it’s edible—but leaving it on means the plant is directing some energy into reproductive growth.

The RHS recommends removing hardneck flower stems when they appear, and Wisconsin Horticulture notes that some types may produce smaller bulbs if the stalks aren’t removed.

Cut scapes while they’re young and tender.

Then use them in:

• Stir-fries.
• Pesto.
• Omelettes.
• Soups.

You’re potentially helping the bulb while getting a bonus crop.

Why Fall Planting Can Produce Bigger Bulbs

Fall-planted garlic doesn’t simply sit dormant until spring.

Roots can establish before severe winter weather, and the plants are ready to grow quickly when conditions improve.

Cold exposure is also important for many varieties.

The RHS notes that most garlic needs one to two months at approximately 0–10°C for good bulb development.

Utah State University Extension similarly explains that fall and winter root development supports rapid spring growth, and large tops are needed to produce large bulbs. So the bigger-bulb advantage isn’t magic.

You’re simply giving the crop more time and the seasonal conditions it naturally prefers.

Hardneck or Softneck: Which Gives Bigger Cloves?

If your definition of “bigger garlic” means fewer but enormous individual cloves, hardneck varieties are particularly attractive.

The RHS notes that hardneck garlic typically produces fewer, larger cloves. Softneck varieties generally contain more tightly packed cloves and tend to store for longer.

That creates a useful choice:

Hardneck: Larger individual cloves, stronger flavour, scapes, generally shorter storage.

Softneck: More cloves per bulb, excellent storage, usually no scapes.

You don’t have to choose only one.

Growing both gives you large-cloved garlic for cooking plus longer-storing bulbs for winter.

Don’t Plant Freshly Manured Ground

This is one shortcut worth avoiding.

Garlic likes fertile soil, but that doesn’t mean burying cloves in fresh manure.

The RHS advises against recently manured ground because it can contribute to rotting and other growing problems.

Use well-rotted manure or mature compost instead.

Ideally, prepare the soil before planting so the cloves go into fertile but stable conditions.

What If Your Garden Is Wet All Winter?

Don’t force autumn garlic into unsuitable ground.

If winter rainfall leaves your soil saturated for weeks, start cloves in modules instead.

The RHS recommends planting individual cloves into modules and keeping them in a cool, sheltered location such as a cold frame before planting them into prepared ground in spring.

That allows garlic to receive cold exposure without sitting in waterlogged garden soil.

Containers are another option, provided they have excellent drainage and enough depth.

When Will Fall-Planted Garlic Be Ready?

Don’t harvest simply because the bulbs look large from above.

Wait for the foliage to give you the signal.

Autumn-planted garlic is generally harvested from late spring through summer, depending on the variety and climate. The RHS recommends harvesting as the leaves yellow, while avoiding excessive delay because over-mature bulbs may split and store poorly.

Use a garden fork to loosen the soil and lift bulbs carefully.

Don’t yank firmly by the leaves—you can damage the neck or bulb.

Cure the Harvest Before Storing It

Growing enormous garlic is only half the job.

If you want it to last, cure it properly.

After lifting, allow bulbs to dry in an airy, protected position until the outer skins and necks have dried.

Don’t wash storage garlic before curing.

Once completely dry:

• Trim roots if desired.
• Remove loose soil.
• Store somewhere cool and dry.
• Keep damaged bulbs for immediate use.

Softneck garlic generally stores longer than hardneck types.

And when you’re admiring the biggest bulbs of the harvest, remember:

Those may be your best seed garlic for next fall.

The Bigger-Garlic Checklist

If you remember nothing else, remember this sequence:

• Plant in autumn.
• Use healthy seed garlic.
• Select the largest cloves.
• Choose full sun.
• Make sure drainage is excellent.
• Give cloves plenty of space.
• Mulch where appropriate.
• Keep spring weeds under control.
• Maintain adequate nutrition and moisture.
• Remove hardneck scapes.
• Harvest on time.
• Save your best bulbs for replanting.

None of those steps is difficult.

Together, however, they can make a dramatic difference.

Final Thoughts

If you want bigger garlic next summer, don’t wait until spring to start thinking about it.

Planting in fall gives garlic the long growing season and cold period many varieties need for strong bulb development. Start with large, healthy cloves, give them fertile free-draining soil and enough space, then keep competition and drought under control once spring growth begins.

The reward comes months later when you push a fork beneath the first yellowing plant and lift a bulb far larger than the clove you buried in autumn.

Sometimes the secret to a bigger harvest isn’t doing more.

It’s simply starting earlier.