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Garlic

Allium sativum

VegetableAlliumOverwinter Easy

Plant cloves in autumn and harvest fat bulbs the next summer. Garlic needs winter cold to split into cloves — hardneck for cold zones, softneck for mild — and curing for long storage.

Growing conditions

Light
Full sun — at least 6 hours of direct sun a day; the more the better for big bulbs
Water
Medium
Soil
Loose, well-drained, fertile loam rich in organic matter; bulbs rot in heavy, waterlogged ground, so raised beds help on clay · pH 6.0–7.0 (slightly acidic to neutral)
When to sow
Plant in fall about 2–6 weeks before the ground freezes, often 1–2 weeks after the first killing frost (commonly mid-September to November depending on zone). You want roots to establish, but little or no top growth, before hard freeze. In zones 8–11, plant in late fall/early winter or use refrigerated cloves.
Spacing
10–15 cm (4–6 in) apart in rows 30 cm (12 in) apart, or 15 cm (6 in) each way in a bed
Days to maturity
About 240–290 days from fall planting (roughly 8–9 months); spring-planted softnecks mature faster but yield smaller bulbs
Hardiness
Grown across USDA zones 3–9 (and into 10–11 with chilled cloves). Match the type to your winter: zones 3–6 are hardneck country; zone 7 is a transition where both work; zones 8–11 favor softnecks and may need pre-chilled cloves because winters are too mild for natural vernalization.

How to grow it

  1. 1

    Plant cloves in fall, pointed end up

    Split bulbs into cloves at planting time and push each one root-end down, tip up, 5–8 cm (2–3 in) deep and 10–15 cm (4–6 in) apart. Plant the biggest cloves — clove size drives bulb size. Work some and a little balanced into the bed first, since garlic is a hungry feeder.

  2. 2

    Mulch for winter

    After planting, cover the bed with 8–10 cm (3–4 in) of straw or shredded-leaf . The mulch steadies soil temperature through freeze-thaw cycles, prevents heaving, holds moisture, and smothers weeds. In cold zones leave it on; in milder zones you can thin or pull it back in spring so the soil warms.

  3. 3

    Feed and weed in spring

    When green shoots appear and start growing fast, side-dress with a nitrogen source (blood meal, feather meal, or a balanced ) to fuel leaf growth — each leaf becomes a bulb wrapper. Keep the bed scrupulously weeded, because garlic's sparse leaves compete poorly and weeds steal water and nutrients.

  4. 4

    Water steadily, then ease off before harvest

    Give about 2.5 cm (1 in) of water a week during active spring growth and deep water in dry spells, keeping the soil evenly moist but never soggy. Then stop watering 2–3 weeks before harvest so the bulbs firm up and the wrappers dry — wet soil at the end invites rot and splitting.

  5. 5

    Snap off the scapes on hardnecks

    In early summer hardneck garlic sends up a curling flower stalk called a scape (the plant trying to ). Cut or it off once it makes one loop — this redirects energy into the bulb instead of the seed head and gives noticeably bigger garlic. Softnecks rarely make scapes.

  6. 6

    Harvest when the lower leaves brown

    Garlic is ready when the lower leaves turn brown and dry but five or six upper leaves are still green — each green leaf is a wrapper protecting the bulb. Loosen the soil with a fork and lift gently; never yank by the stalk. Dig too late and the wrappers split and the bulb falls apart in storage.

  7. 7

    Cure for storage

    Don't wash the bulbs. Lay or hang the whole plants in a warm, dry, airy, shaded spot with good airflow for 2–4 weeks to . Curing dries the wrappers and necks so the garlic stores for months. Once the necks and outer skins are papery and the roots are dry, trim roots and tops and brush off loose soil.

Gardener's notes

  • The cold requirement is for the cloves to DIVIDE a bulb into segments, not to 'start' the plant — a hardneck without enough winter chill grows fine but makes a single undivided round instead of cloves. In mild zones, pick softnecks or pre-chill cloves in the fridge for 6–8 weeks.
  • Bigger cloves make bigger bulbs, so plant the large outer cloves and cook the small inner ones — and never plant supermarket garlic, which is usually softneck, possibly -treated, and may carry disease.
  • Snapping off hardneck scapes isn't just tidy — it can add meaningful size to the bulb, and the scapes themselves are a bonus early harvest weeks before the garlic is dug.

Varieties worth knowing

Music (porcelain hardneck)
Hardneck. Large, easy-to-peel cloves, strong flavor, very cold-hardy and a top choice for northern zones 3–6; produces scapes.
German Extra Hardy (porcelain hardneck)
Hardneck. Cold-tough, big-cloved, robust flavor; classic for cold-winter gardens and stores moderately well.
Chesnok Red / Purple Stripe (hardneck)
Hardneck. Purple-striped wrappers, sweet roasting flavor; needs a real winter chill to bulb well.
Rocambole types like German Red (hardneck)
Hardneck. Rich, complex flavor and easy peeling, but shorter storage life and the most cold-dependent group.
Inchelium Red (softneck artichoke)
Softneck. Mild, large bulbs that store a long time; adaptable and a good pick for milder zones 7–9.
California Early / California Late (softneck)
Softneck. The braiding and grocery-store types; low chill needs, long storage, best for warm zones 8–11.

Common problems & fixes

White rot (Sclerotium cepivorum)
Sign: Yellowing, wilting, dying leaves; a fluffy white fungal mat and tiny black sclerotia (poppy-seed-sized) on the bulb base and roots, often rotting the whole bulb.
Fix: The most destructive garlic disease and there's no cure once present — the soil-borne sclerotia survive 20–40 years. Plant only clean, certified seed garlic, never replant from infected beds, rotate away from all alliums for many years, and remove and destroy infected plants soil and all.
Rust (Puccinia allii)
Sign: Small orange-to-rusty raised pustules scattered on the leaves; heavy infection browns the foliage early and shrinks the bulbs.
Fix: Space plants for airflow, avoid overhead watering and excess nitrogen, weed well, and rotate away from alliums for 2–3 years. Remove badly infected leaves; pick more tolerant varieties where rust is a recurring problem.
Bulb splitting / shattering
Sign: Cloves burst out of the wrappers, the bulb splits open in the ground, and skins won't hold — poor storers.
Fix: Usually harvested too late, or planted too shallow, or hit with uneven water. Plant at least 5 cm (2 in) deep (deeper in cold zones), keep moisture steady, ease off water before harvest, and lift when five or six upper leaves are still green rather than waiting for the tops to die fully.
Bulbs that never divide (single round 'rounds')
Sign: Harvest is one smooth, undivided round like a small onion instead of a segmented bulb.
Fix: Almost always too little winter cold (vernalization) for a hardneck, or a clove planted too small or too late. Grow hardnecks only where winters are cold enough, plant on time in fall, use large cloves, and in mild zones switch to softnecks or pre-chill cloves.
Onion / allium thrips
Sign: Silvery streaks and stippling on leaves, leaf tips drying and curling, tiny slender insects hiding in the leaf folds.
Fix: Hose plants down, keep them watered and unstressed, and rotate away from onions and garlic. Encourage natural predators; treat with insecticidal soap only if damage is heavy, since healthy garlic usually shrugs off light pressure.

Companions

Grows well with
TomatoesCarrotsBeetsLettuceCabbage and other brassicasStrawberries (as a pest deterrent border)Roses and fruit trees (sulfur compounds deter aphids and mites)
Keep apart from
BeansPeasOther legumes (they fix nitrogen, which pushes leaves over bulbs)AsparagusSage

Harvest & storage

Harvest
Harvest in early to midsummer (commonly late June through July, later in cold zones) when the lower leaves have browned but five or six upper leaves are still green. Loosen the soil with a fork and lift the whole plant gently by the bulb — don't pull on the stalk or scrub the bulbs. Lifting too late causes the wrappers to split and the bulb to fall apart, ruining storage.
Storage
Cure first: hang or lay the unwashed plants in a warm, dry, shaded, airy place for 2–4 weeks until the necks, wrappers, and roots are dry and papery. Then trim roots and tops, brush off soil, and store in a cool, dry, dark, airy spot around 0–4°C (32–40°F) or a cool room at 50–60% humidity. Softnecks keep 6–12 months; hardnecks keep a shorter 3–6 months. Don't store near the stove (sprouting) or in the crisper drawer (too humid), and save your best bulbs to replant in fall.

Sources

This guide is curated from authoritative horticulture references — primarily US university Extension services, the USDA, and the RHS.