Vegetable · Amaryllidaceae
Garlic
Allium sativum
Tuck a clove into the ground in fall and let it be until summer, when that single clove becomes a whole head.
Full sun
Every 3–7 days
240–270 days
USDA 3–8
Overview
Garlic gives back far more than it asks, which makes it a wonderful place to begin. You settle one clove into the ground in autumn, and over the next eight or nine months it quietly roots through winter, sends up green leaves in spring, and rounds out into a full head by midsummer. It belongs to the onion family, and you can feel that kinship in its flat leaves and its warm, pungent bite in the kitchen.
There are two friendly camps to choose from, and neither is wrong. Hardneck types raise a firm central stalk and a curling flower stem called a scape, keep for a few months, and take hard winters without complaint. Softneck types skip the stalk, pack more cloves into each bulb, store much longer, and braid up neatly, which makes them a comfortable choice in milder regions.
The one thing to make peace with is that garlic will not be hurried, and that is genuinely freeing. The plant needs a real winter chill to split a single clove into a proper head, so the calendar sets the pace, not anything you did or forgot. Get the timing right and the rest asks little more than mulch, an early feed, and patience, all well within reach for a first-time grower.
Care
The short version: settle your biggest cloves into loose, fertile, well-drained soil and full sun in fall, keep the bed evenly moist through spring, feed nitrogen early, then ease off the water as the bulbs cure toward harvest, and you will do just fine.
Light
Garlic loves full sun, ideally 6 or more hours a day, which is what builds a nice big bulb. It will still manage in partial sun if that is what you have, though the heads come out smaller and the plants a touch weaker, so give it the brightest spot you can.
Water
Keep the soil evenly moist through spring growth, roughly an inch of water a week, without ever letting it sit soggy. Then ease off and stop watering in the last 2 weeks before harvest, which helps the bulbs cure and store well, so a little restraint at the end really pays off.
Soil
Plant into loose, fertile, well-drained loam with plenty of organic matter mixed in, at a pH between 6.0 and 7.0. If your ground leans toward heavy clay, do not worry, since a raised bed keeps the bulbs from sitting wet and rotting.
Temperature
Garlic is tougher than you might think, comfortable across a wide range from about 14°F to 86°F (-10°C to 30°C), and it actually needs a real winter chill to turn one clove into a full head. That cold spell is the whole reason the cloves go in during fall.
Humidity
Ordinary outdoor humidity suits garlic just fine, so there is no number to chase and nothing to fret over here. Good airflow matters more, since damp, crowded leaves are what invite rust and other fungal trouble.
Feeding
Mix compost or a balanced fertilizer into the bed when you plant in fall, then side-dress with nitrogen in early spring as the leaves come up. Ease off feeding once the bulbs begin to form, around the time scapes emerge, or you end up growing leaves at the bulb's expense.
Pruning
Garlic asks almost nothing in the way of pruning, which is a relief. On hardneck types, snap off the scapes soon after they emerge and curl so the plant pours its energy into the bulb instead of the flower stalk, and those scapes are lovely to cook with, so nothing goes to waste.
Size & spacing
Plants grow 12 to 24 inches (30 to 60 cm) tall with slim, upright leaves. Set the cloves 6 to 12 inches (15 to 30 cm) apart so each one has room to swell into a good head and air can move freely between them.
When to plant
Garlic follows the calendar, and that makes it forgiving. Plant the cloves in fall, 4 to 6 weeks before the ground freezes, so they can root before winter, then let the cold do its quiet work and lift the bulbs in mid to late summer once the lower leaves have browned.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Fall, about 4-6 weeks before the ground freezes (typically late September through November depending on region), so cloves root before winter
- Harvest: Hardneck scapes appear in early summer and are removed; harvest bulbs in mid-to-late summer when the lower one-third to one-half of the leaves have yellowed and browned
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Most garlic worries show up either in the leaves you can see or in the bulb you only meet at harvest, and neither should rattle you. Catch the leaf signs early and you can usually save the crop, while a rotting bulb just needs pulling right away. Find your symptom below, then act before it travels down the row.
Yellowing leaves and white fluff, with dark flecks near the bulb
If plants yellow and the bulb base carries white fluff and tiny black specks, you are looking at white rot, a soil fungus that can linger in the ground for decades waiting on the next allium. There is no way to save an affected plant mid-season, so lift it along with the soil around it and bin the whole lot instead of composting. Its gentler lookalike is fusarium basal rot, which leaves a pinkish-white stain but none of those poppy-seed black sclerotia, and knowing the difference helps you plan next year.
Fix:
- Remove and destroy infected plants and surrounding soil; do not compost
- There is no effective in-season chemical rescue for home gardens
Orange rusty bumps on the leaves
Raised orange bumps on the foliage are garlic rust, a fungus that settles into cool, humid, crowded beds and puffs out powdery spores the moment you brush a leaf. Take heart, because the fix is simple: pull off the worst leaves and open the spacing so air can dry the plants. Should it arrive late in the season, just harvest a little early, since the bulbs waiting underneath are perfectly good to eat.
Fix:
- Remove heavily infected foliage
- Harvest promptly if infection occurs late in the season; bulbs are still edible
Little heads that will not break into separate cloves
When a bulb stays small or comes up as one solid lump, it almost always went short on its cold winter, either set out too late in fall or pushed in during spring without time to root and chill. Weeds shading the thin upright leaves and a missed spring nitrogen feed only add to it. There is nothing wasted here, since the little ones cook up beautifully, and next time you simply plant the largest cloves 4 to 6 weeks before the ground freezes.
Fix:
- Use undersized bulbs in the kitchen; they are edible
- Adjust planting date and fertility the following season
Silver flecks and a grayish tint on leaves during hot spells
Silvery flecks that spread as the weather turns hot and dry are the work of onion thrips, tiny insects that rasp away at the leaf surface. Gently part the leaves and peer into the folds for slender yellow-brown specks, or tap a plant over white paper and watch them tumble down. A strong jet of water knocks them back, insecticidal soap handles heavier damage, and keeping plants watered through dry spells makes the whole thing easier.
Fix:
- Knock populations down with a strong spray of water
- Use insecticidal soap if damage is heavy, ensuring coverage in leaf axils
Toxicity
Garlic is a cherished kitchen staple for people, yet it is genuinely dangerous for animals, so it helps to hold both truths at once. The same organosulfur compounds that give garlic its flavor attack the red blood cells of cats, dogs, horses, livestock, rabbits, and birds and can bring on hemolytic anemia in any form, raw, cooked, or powdered. Cats are the most sensitive of all, and garlic is more potent than onion by weight, so keeping every bit of it away from pets and stock is the loving thing to do.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Severe
A cat may vomit, have diarrhea, drool, and turn weak and lethargic, with pale gums, a racing heart, fast breathing, red or brown urine, and collapse as hemolytic anemia sets in. Cats are the most sensitive of all, so even a small taste is worth a call to the vet.
Dogs Moderate
In a dog, watch for vomiting, diarrhea, belly pain, weakness and lethargy, pale gums, a quickened heart and breathing rate, and red or brown urine. A large or repeated helping can push it into severe hemolytic anemia, so do not wait it out.
Horses Moderate
A horse that eats a meaningful amount can grow weak and listless, with pale mucous membranes and discolored urine as hemolytic anemia takes hold. Keep garlic and its trimmings out of reach and away from the paddock.
Rabbits Toxic
Garlic simply has no place in a rabbit's bowl. The same organosulfur compounds that harm cats and dogs go after a rabbit's red blood cells too, and no amount is safe, so keep every form of it well away from them.
Livestock Toxic
Cattle, sheep, goats, and horses that graze on garlic or its trimmings can develop hemolytic anemia, which turns up as weakness, a dull manner, pale gums, and dark, discolored urine. Fence stock out of the bed and never hand them allium scraps.
Birds Toxic
Garlic is not safe for birds, from backyard poultry to a pet parrot. Even small amounts can break down their red blood cells over time, so keep bulbs, cloves, and any seasoned scraps well out of reach.
People Safe
Good news for the cook: garlic is a kitchen staple and perfectly safe for people to eat, raw or cooked. The danger that hangs over animals does not apply to us, so go ahead and enjoy it freely.
Store bulbs, peeled cloves, garlic powder, and garlic-seasoned foods where pets cannot reach them; fence or cover garden beds, and never feed pets table scraps containing garlic or onion. Signs of anemia can be delayed several days after ingestion.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
Hundreds of garlic cultivars are out there, but they gather into a handful of familiar hardneck and softneck types, so there is no need to feel overwhelmed. These are the ones you are most likely to meet.
Music
A hardneck porcelain type that gives you 4 to 6 plump, easy-to-peel cloves in each bulb and takes hard winters in stride, which makes it a friendly, reliable pick for northern gardens.
German Extra Hardy
A hardneck porcelain type loved for holding up through bitter cold winters while delivering a strong, full flavor at the table.
Inchelium Red
A softneck artichoke type with a mild taste and lots of cloves per head that is happiest in milder climates and braids up beautifully.
Silver Rose
A softneck silverskin type with pretty rose-tinted cloves that keeps in storage longer than almost any other garlic and has long been a favorite for braiding.
Companions
Garlic earns its keep as a neighbor, since its sulfur compounds help drive off aphids and other soft-bodied pests, but it sets back the legumes, so keep it clear of beans and peas.
Plant near
roses: Garlic's sulfur compounds are reported by extension sources to help deter aphids and other soft-bodied pests around roses
brassicas (cabbage family): Interplanted garlic can help repel some cabbage-family insect pests
carrots: Garlic may help deter carrot pests such as rust fly, and the crops do not compete strongly
Keep apart
beans: Alliums are reported to inhibit the growth of beans and other legumes
peas: Alliums are reported to inhibit the growth of peas and other legumes
How to propagate
Garlic makes more of itself from its own cloves, which is about as easy as planting ever gets, though it repays you gently on its own unhurried schedule.
Bulbs & cormsEasy
Fall, 4-6 weeks before the ground freezes · Roots establish in 4-8 weeks before the ground freezes; bulbs are ready to harvest about 8-9 months after planting
Garlic grows from cloves rather than seed, so just before planting you gently break a bulb apart and leave the papery wrapper on each clove. Set the biggest ones pointed end up, about 2 inches deep and 4 to 6 inches apart, 4 to 6 weeks before the ground freezes, then tuck a layer of mulch over them once the soil cools so they root through the next month or two before winter. The one real ask is patience, since the bulbs will not be ready to lift until 8 to 9 months later in mid to late summer. If you feel adventurous, the little topset bulbils from hardneck scapes will grow too, though they need 2 to 3 seasons to reach full size.
Myths
Garlic makes a safe, natural way to keep fleas and ticks off dogs and cats.
Please steer clear of this one, because it is genuinely dangerous. Garlic is toxic to cats and dogs in every form, since its thiosulfates damage red blood cells and can trigger Heinz-body hemolytic anemia, and cats feel it worst of all. No dose is safe or proven to work against parasites, so a vet-approved product is the kind and effective choice.
Garlic from the grocery store will do just fine for planting.
It is a tempting shortcut, but supermarket garlic is often treated with sprout inhibitors, can carry disease, and tends to be a variety that never really suited your climate. Plant certified disease-free seed garlic from a good supplier and you give yourself a clean, confident start.