How to Plant Garlic This Fall: The $24 Investment That Pays for Itself by Summer

Late September is one of the best times of the year to spend an afternoon in the garden. Not because there's much to harvest, but because of what you can put in the ground now that pays you back all next summer. Garlic tops that list. It asks for about thirty minutes of work, a couple of inches of mulch, and then basically nothing until spring. And the math on it is better than almost anything else you can grow.

The money math: one pound of seed, six to eleven pounds of garlic

Let's run the numbers the way a farmer would. Organic seed garlic from reputable growers runs roughly $22 to $27 a pound. Earthwise Farm & Forest lists its 2026 organic seed garlic at $24 a pound ($22 for five pounds or more), Hudson Valley Seed Company sells organic seed garlic for $26.99 a pound, and Mary's Heirloom Seeds charges $24 a pound. So call it $24 for a pound of hardneck seed garlic, which gives you roughly 40 to 60 plantable cloves depending on the variety, according to Tamarack Garlic Farm's seed calculations.

Now the return. Tamarack Garlic Farm estimates that one pound of planted seed garlic yields about 6 pounds for porcelain varieties, 9 pounds for purple stripes, 7 pounds for rocambole types, and 11 pounds for artichoke softnecks. Split the difference and figure 7 to 9 pounds of harvested garlic from your $24 investment.

What is that worth? At a farmers market, organic garlic averaged $2.80 per head in the USDA's June 2025 Farmers Market Vegetable Price Report. Seven pounds of garlic works out to roughly 45 to 60 bulbs at typical bulb weights, which puts the retail value of one $24 pound of seed garlic somewhere around $125 to $165. Even at wholesale organic garlic prices of $3.50 to $4.50 a pound reported by The Produce News in August 2026, the harvest comes in well above what you paid for seed.

And here's the part that makes garlic the gift that keeps giving: you never have to buy seed garlic again. Cornell's extension guidance notes you can set aside your largest bulbs each harvest and plant them the following fall. Year two onward, your only costs are compost and mulch.

Do not plant grocery store garlic

This is the mistake that sinks more first-time garlic growers than anything else. The garlic in the produce aisle is not seed garlic, and University of Minnesota Extension and the UConn Home & Garden Education Center both advise against planting it. Grocery store garlic is usually softneck stock that may not perform in cold climates, it can be treated with growth inhibitors that suppress sprouting, and it can carry pests or diseases into your soil. White rot, once established in a bed, can persist for years. A pound of certified seed garlic from a reputable grower costs a little more than a bag of grocery bulbs, but it is disease-checked stock adapted for planting. That is not the place to economize.

Which type to buy depends on your winters. Hardneck varieties (rocambole, purple stripe, porcelain) are the cold-hardy choice for northern growers, and they produce edible scapes in spring. Softneck varieties (artichoke, silverskin) suit warmer climates and store longer, often up to eight months, according to Hudson Valley Seed Company. Most seed sellers note which varieties suit which zones, and ordering early matters because popular varieties sell out by October.

How to plant: timing, depth, and spacing

Garlic needs a cold period to form bulbs, which is exactly why it goes in the ground in fall. The University of Maryland Extension notes garlic must be exposed to temperatures between 32 and 50 degrees Fahrenheit for about two months before the long days of spring trigger bulbing. Fall-planted garlic establishes a strong root system and gets that cold treatment naturally.

When: The standard rule from multiple university extensions is one to two weeks after the first killing frost. For most of the northern U.S., that means mid-to-late October. Sustainable Market Farming, the resource from market grower Pam Dawling, suggests planting when the soil temperature at four inches deep reads about 50 degrees at 9 a.m., and waiting a week if the fall is unusually warm. A soil thermometer costs a few dollars and takes the guesswork out.

How: Loosen the bed to about eight inches and work in compost or well-rotted manure. Garlic wants full sun, fertile soil with a pH around 6.2 to 7.0, and good drainage. It hates wet feet, so raised beds are ideal if your soil stays soggy. Break bulbs into individual cloves a day before planting, and plant only the biggest, firmest cloves. Place each clove pointy end up, 2 to 3 inches deep (Cornell's guidance), spaced 4 to 6 inches apart in rows 12 to 24 inches apart.

Mulch: This step is non-negotiable in cold climates. A few inches of straw, shredded leaves, or clean hay over the bed keeps soil temperatures steady and prevents the freeze-thaw cycles that heave cloves out of the ground. When properly planted and mulched, garlic can survive winter lows down to minus 30 degrees, according to Sustainable Market Farming. Best of all, that leaf mulch is free if you have trees on your property, which turns a fall chore into a garden input.

Spring and summer: scapes, water, and the harvest

Garlic is gloriously low-maintenance once spring arrives. Keep it watered and weeded, and feed it once or twice in early spring if your soil is lean. If you planted hardneck garlic, watch in late spring for scapes, the curling flower stalks that rise from the center of each plant. Snap or cut them off when they make one full curl. This redirects the plant's energy into the bulb instead of the flower, and the scapes themselves are a delicacy, great in pesto or stir-fries. Softneck garlic won't produce them, so don't wait around for something that isn't coming.

Harvest comes in mid-summer, usually June through August depending on your climate. The signal: the lower leaves turn yellow-brown while several upper leaves are still green. Cornell advises lifting plants when about half have yellowed and browned. Dig, don't pull, using a fork to avoid bruising the tender bulbs. Then cure the bulbs in a shaded, airy spot for two to three weeks before trimming and storing them in a cool, dry place.

That first head of garlic you grew yourself, braided or bagged in the pantry, is when the fall effort clicks into place. Twenty-four dollars in October. A summer of organic garlic, scapes in spring, and seed stock for next year already set aside. There is no fertilizer sale and no bagged amendment that beats that return.

FAQ

When is the best time to plant garlic in the fall? Plant one to two weeks after the first killing frost in your area, which is typically mid-to-late October for the northern U.S. and November in warmer zones. A more precise method: plant when the soil temperature at four inches deep is about 50 degrees Fahrenheit at 9 a.m.

How deep should garlic cloves be planted? Plant cloves pointy end up, 2 to 3 inches deep, spaced 4 to 6 inches apart, according to Cornell's extension guidance. Planting too shallow exposes cloves to winter damage; planting too deep can interfere with bulb formation.

Can I plant garlic from the grocery store? It is not recommended. University extensions in Minnesota and Connecticut advise against it: grocery store garlic may be treated with sprout inhibitors, may not suit your climate, and can introduce diseases like white rot into your soil. Buy certified seed garlic from a reputable grower.

How much garlic do you get from one pound of seed garlic? Roughly 6 to 11 pounds of harvested garlic per pound planted, depending on variety, according to Tamarack Garlic Farm's yield estimates. At about 2 to 3 ounces per bulb, that is roughly 40 to 60 heads from a $24 pound of seed.

Does garlic need to be mulched after planting? Yes. A few inches of straw or shredded leaves after planting keeps soil temperatures steady and prevents freeze-thaw heaving. Properly mulched garlic can survive winter temperatures as low as minus 30 degrees Fahrenheit.