How to Plant Garlic (Depth, Spacing, and Timing)

Garlic is a one-season commitment. You plant it in fall, it sits underground all winter, then it bulks up and finishes in early summer. Get the depth, spacing, and timing right at planting and the rest of the season mostly takes care of itself.

How much seed garlic do I need?

One clove grows one bulb. So the number of cloves you plant is the number of bulbs you harvest, minus any losses.

Buy seed garlic by the pound. Maryland Extension counts 6 to 7 bulbs per pound of large hardneck garlic, with 6 to 7 cloves per bulb. That works out to 36 to 49 cloves per pound, or about 42, which is the figure the calculator uses. Wisconsin Extension says about 50. Order a little extra, 10% or so, since not every clove sprouts.

The calculator's default spaces cloves 4 inches apart in rows 12 inches apart. Roomy rows use 6 inches between cloves for bigger bulbs. The square-foot method packs 9 cloves into every square foot, which fits more but grows smaller bulbs. A 4x4 bed holds 48 cloves at the calculator's default, 32 at roomy row spacing, or 144 at the tighter square-foot rate. Pick one method and stick with it for the whole bed, or the count won't add up.

When to plant garlic by zone

The target is the same everywhere: get cloves in the ground early enough to root, but late enough that they don't push leaves up before winter. Penn State Extension calls for planting a good three weeks before the ground freezes. Oregon State puts the window at September through November for most of Oregon.

Colder zones freeze sooner, so they plant sooner.

These are starting points, not deadlines. Watch your own first-frost date, not the calendar. If you're still working out your exact date, the when to plant garlic guide breaks the timing down further.

Is it too late to plant?

If the ground isn't frozen yet and you have 2 to 3 weeks before your first hard freeze, go ahead and plant. That's still enough time for roots to set without the shoot pushing above ground.

Missed the window entirely? Hold your seed garlic in a cool, dry, dark spot over winter and plant it in early spring instead, as soon as the ground can be worked. University of Minnesota Extension is blunt that spring-planted garlic without a cold spell first makes weak shoots and smaller bulbs, so treat spring planting as a backup, not the plan.

How deep and how far apart

This is where sources genuinely disagree, so here's the honest range from each one.

Plant about 2 inches deep as your default, and go to 3 inches in cold-winter zones where frost heave is a risk. Space cloves 4 to 6 inches apart in the row, wider for your biggest seed cloves. Row width from 10 to 14 inches works for hand tools, wider still if you walk or till between rows.

Hardneck vs softneck: which one to plant

The two garlic families split on cold tolerance, storage, and how they grow.

Wisconsin Extension says hardneck types perform best where winters are long and cold. Softneck types are better adapted to mild winters and long growing seasons. So cold zones (3 to 6) lean hardneck, mild zones (8 to 9) lean softneck, and zones 6 to 7 can grow either.

How to plant garlic, step by step

1. Break the bulb into cloves the same day you plant. Don't crack bulbs open days ahead, it dries out the root nodules and shrinks the bulb.
2. Keep the papery skin on each clove. Don't peel it. The skin protects the clove from rot in the soil.
3. Pick the biggest cloves for planting. Bigger cloves grow bigger bulbs. Save small inner cloves for the kitchen.
4. Set each clove pointed end up. The flat base grows roots, the point grows the shoot. Planted upside down, the shoot has to curl around and the bulb comes out misshapen.
5. Plant about 2 inches deep. Go to 3 inches in cold zones.
6. Space cloves 4 to 6 inches apart, in rows 10 to 14 inches apart, or use the Plant Spacing Calculator for a raised bed.
7. Cover, firm the soil, and water once to settle the cloves in.
8. Mulch with 3 to 6 inches of straw right after planting.

Mulching for winter

Mulch protects cloves from freeze-thaw heaving and holds moisture. It also smothers early spring weeds before the garlic gets going.

Apply straw mulch right after planting. Iowa State recommends a 4 to 6 inch layer, applied in November. Oregon State recommends 3 to 4 inches for most of the state, going to 5 to 6 inches in the coldest parts of eastern Oregon.

Leave the mulch loose enough that shoots can push through it in spring. Pull it back gradually once hard freezes are done and the soil starts to warm, or leave a thin layer in place for weed control through the season.

Common planting mistakes

A handful of errors account for most weak garlic stands.

• Planting too early, so shoots emerge before winter and get damaged by cold.
• Planting too late, so cloves never root before the ground freezes.
• Cracking bulbs into cloves days before planting instead of the same day.
• Planting too shallow in a cold zone, risking frost heave.
• Skipping mulch and losing cloves to freeze-thaw cycles.
• Planting grocery-store garlic instead of zone-appropriate seed stock.

Fix all six with one habit: plant fresh-cracked cloves at the right depth for your zone, on time, and mulch right after.

Your next step

Plant garlic in fall, 2 to 4 weeks before the ground freezes, about 2 inches deep and 4 to 6 inches apart. Mulch with 3 to 6 inches of straw and you're done until spring.

Work out your exact clove count and cost with the Garlic Planting Calculator, or check spacing for a mixed bed with the Plant Spacing Calculator. For the harvest side of the season, see when to harvest garlic, and pair your garlic bed with garlic companion plants.