How to Grow Garlic (US Guide)

Why grow garlic?

Garlic is planted in fall and harvested the following summer — a nine-month commitment that produces 8–12 months of storage garlic from a single raised bed. One pound of seed garlic planted in October yields 8–10 pounds of harvested garlic by July.

Growing your own garlic offers access to hardneck varieties unavailable in most US grocery stores. Hardneck types (Rocambole, Porcelain, Purple Stripe) have richer, more complex flavor than the commercial softneck garlic that dominates US supermarkets. Growing your own is the primary way most US cooks access these premium varieties.

Hardneck vs. softneck garlic: choosing for your zone

The single most important garlic decision is choosing the right type for your climate.

Hardneck types for Zones 3–6:

• Rocambole (German Red, Killarney Red): excellent flavor; shortest storage (4 months)
• Porcelain (Music, Georgian Crystal, German Extra Hardy): large bulbs; 4–6 months storage; best performer in Zone 4–6
• Purple Stripe (Chesnok Red, Persian Star): complex flavor; good storage; some bolt resistance

Softneck types for Zones 7–9:

• Artichoke (Inchelium Red, California Early): reliable in warm winters; large bulbs; 8–12 months storage
• Silverskin (Nootka Rose, Chet’s Italian Red): longest storage (up to 12 months); smaller cloves; braids well

In Zone 6 (the border between the two types), both hardneck and softneck perform reasonably well. Most Zone 6 gardeners prefer hardneck for flavor; some use softneck for longer storage life.

When to plant garlic in your zone

Plant garlic 4–6 weeks before the ground freezes — enough time for roots to establish but not enough for significant top growth before winter. In most US zones, that window falls between October and December.

In Zone 3–4, planting too late risks not getting root establishment before soil freezes. In Zone 9–10, planting too early risks top growth before vernalization (cold period), which is needed for bulb formation. Follow the dates above for your zone.

Preparing soil for garlic

Garlic needs loose, well-draining, fertile soil with pH 6.0–7.5. It rots in waterlogged soil and produces small, poorly-formed bulbs in compacted ground.

Soil prep steps:

1. Test soil pH — see our how to test soil pH guide for the process
2. Work in 2–3 inches of compost for organic matter and drainage improvement. Our how to start composting guide covers building homemade compost
3. If soil pH is below 6.0, add ground limestone 4–6 weeks before planting (5–10 lbs per 100 sq ft)
4. If soil is clay-heavy, add perlite or coarse sand to improve drainage
5. Apply a balanced fertilizer (5-5-5 or 8-8-8) at 2–3 lbs per 100 sq ft and work into the top 6 inches

Raised beds are ideal for garlic in the US — they provide the drainage and loose soil structure that garlic needs and warm up faster in spring, supporting bulb development. A 4x8-foot raised bed holds 64 garlic plants (at 6-inch spacing) — enough for most US families.

How to plant garlic cloves

Break the garlic bulb into individual cloves right before planting. Plant each clove pointed-end up, flat-end down. Do not remove the papery wrapper around each clove — it protects against disease.

Planting method:

1. Break bulbs into individual cloves 24–48 hours before planting
2. Sort by size — plant the largest cloves; save small cloves for cooking
3. Make furrows or individual holes with a dibber, trowel, or finger
4. Plant cloves 2–3 inches deep (3–4 inches in Zone 3–5), 6 inches apart, in rows 12 inches apart
5. Cover with soil and firm gently
6. Water in after planting
7. Apply 3–4 inches of straw mulch over the bed after planting to insulate soil and suppress spring weeds

In Zone 3–5, the straw mulch is especially important — it moderates freeze-thaw cycles that can push cloves out of the ground (frost heaving) if soil is shallow.

Spring garlic care

Garlic emerges in early spring as green shoots. Here’s what to do:

Fertilize: as soon as shoots emerge, apply a nitrogen-rich fertilizer (blood meal at ½ cup per 10-foot row, or a balanced liquid fertilizer) to support leaf growth. Stop fertilizing by early May in Zones 5–7 — fertilizing too late pushes leaf growth at the expense of bulb formation.

Watering: garlic needs 1 inch of water per week from emergence through late May. Reduce watering in June as leaves begin to yellow — wet conditions at this stage promote mold in the forming wrappers.

Weeding: keep the bed weed-free through April. After that, garlic suppresses most weeds through shading.

Remove mulch partially: push mulch aside in early spring to let shoots emerge, then push it back around plants after they’re 3–4 inches tall.

Garlic scapes: what they are and what to do

Hardneck garlic varieties produce scapes — the long, curling flower stalks that emerge from the center of the plant in late spring (May–June in most US zones).

Remove scapes when they have completed one full curl. Removing scapes redirects the plant’s energy from seed production to bulb development. Research from Penn State Extension confirms that removing scapes at the correct time (first full curl) increases bulb weight by 20–25% compared to leaving them.

After scapes are removed, harvest the scapes — they’re edible. Chop raw into salads, blend into pesto, roast whole, or sauté. Scapes taste like mild garlic and are a seasonal food widely prized in US farm markets from late May through June.

When and how to harvest garlic

Harvest garlic when the bottom 3–4 leaves have turned brown and dried, while the top 5–6 leaves remain green. Each green leaf at harvest corresponds to one intact wrapper layer around the bulb — more green leaves mean better-wrapped bulbs that store longer.

Harvest timeline:

• Zone 3–4: late July
• Zone 5–6: late June to early July
• Zone 7–8: early to mid-June
• Zone 9–10: mid-May to early June

How to harvest:

1. Stop watering 2 weeks before anticipated harvest to dry the soil and outer bulb wrappers
2. Loosen soil around bulbs with a garden fork — don’t pull by the stem
3. Lift bulbs carefully with the fork
4. Leave tops and roots intact for curing

Test dig: pull 1–2 plants from different areas of the bed to check development before harvesting the whole bed. Properly developed bulbs have well-defined individual cloves under the wrapper.

Curing and storing garlic

Cure freshly harvested garlic for 3–6 weeks (hardneck) or 4–8 weeks (softneck) in a warm (70–80°F), dry, well-ventilated location out of direct sun. Uncured garlic deteriorates rapidly.

Curing setup:

• Bundle 8–10 plants together and hang in a barn, garage, or covered porch
• Or lay flat on wire mesh racks with good air circulation
• Avoid curing in a closed space with high humidity — this causes mold
• Temperature range for curing: 70–80°F with low humidity

After curing, trim the tops and roots (hardneck) or trim just the roots and leave the tops for braiding (softneck). Store in a cool (50–60°F), dry location with good airflow.

What to harvest Garlic link for your harvest timing: The Farmers’ Almanac frost-date calculator and our when to harvest garlic guide both cover the specific timing signals that indicate readiness by region.

Garlic pests and diseases in the US

Onion thrips

Tiny (1/25 inch) insects that cause silver streaking and stippling on garlic leaves. Heavy infestations stunt plants and reduce bulb size.

Control: row cover at planting prevents adult thrips from reaching plants. Spinosad spray is effective organic treatment once populations establish.

Onion maggots

Fly larvae that tunnel into garlic bulbs at soil level, causing rot and plant death. More common in the upper Midwest and Northeast.

Prevention: crop rotation (no alliums in same bed for 3+ years); row cover at planting.

White rot (Sclerotium cepivorum)

A devastating fungal disease that causes fluffy white mold at the base of plants and kills bulbs. It persists in soil for 20+ years. There is no chemical cure.

Prevention: do not introduce contaminated soil or equipment; purchase certified disease-free seed garlic from reputable US suppliers like Southern Exposure Seed Exchange or Keene Organics.

Companion planting with garlic

Garlic is one of the most valuable companion plants in the US vegetable garden. Its sulfur compounds repel a range of pests when planted alongside susceptible crops.

Good companions:

• Tomatoes: garlic repels aphids and spider mites that attack tomatoes
• Roses: traditional companion; garlic deters aphids
• Brassicas: garlic reduces cabbage moth activity nearby

Avoid planting garlic near beans or peas — garlic inhibits their growth.

For growing garlic alongside other crops in a small space, our how to start a vegetable garden guide covers companion planting layout for multi-crop US beds.