Journal/Vegetable Garden · 6 min read
When to Plant Garlic (and How to Do It Right)
Garlic goes in the ground in autumn, 2–6 weeks before it freezes. Exact timing by climate, hardneck vs softneck, depth, spacing, and mulch.
Quick answer
Plant garlic in autumn — roughly late September to November in most temperate climates — about 2–6 weeks before the ground freezes, once soil has cooled to around 10 °C. Set individual cloves pointy end up, 5 cm deep and 10–15 cm apart. Garlic needs a cold period (vernalization) to split into a full bulb, and is harvested early-to-mid the following summer.
Garlic is the most patient crop in the vegetable garden: you plant it as the season winds down, forget about it all winter, and lift fat bulbs the following summer. It's also nearly foolproof — if you get the timing right. Plant too early and it puts up soft top growth that winter burns; too late and roots don't establish before the freeze. Here's exactly when to plant, clove by clove.
Why garlic is planted in autumn
A garlic clove needs two things to become a fat, divided bulb: time to grow roots, and cold. During autumn the clove anchors itself with roots while producing little or no top growth. Then winter delivers the crucial ingredient — vernalization. Several weeks of soil temperatures below about 10 °C signal the clove to divide into multiple cloves come spring. Skip the cold, and you harvest a single round mini-bulb instead of a proper head.
The timing rule
- Cold-winter climates: plant from late September through October, about 2–6 weeks before the ground freezes solid — after the autumn equinox is a good anchor.
- Temperate climates with mild frost: October into November works well; the soil should have cooled to roughly 10 °C.
- Mild-winter climates: plant November–December, and choose softneck varieties; where winters stay warm, pre-chill seed garlic in the fridge for several weeks before planting.
- Spring planting is a fallback only: plant as early as the soil can be worked, expect smaller bulbs, and chill the cloves first.
Hardneck or softneck?
| Hardneck | Softneck | |
|---|---|---|
| Climate | Best for cold winters | Best for mild winters |
| Flavour | Complex, often stronger | Milder, classic supermarket taste |
| Bonus | Edible flower stalks (scapes) in early summer | Braids beautifully |
| Storage | About 5 months | 8 months or more |
| Cloves | Fewer, larger, around a stiff stem | Many, in layers, flexible neck |
How to plant, step by step
- Pick a sunny bed with loose, well-drained soil, ideally enriched with a few centimetres of compost; garlic likes a pH around 6.4–6.8.
- Break bulbs into cloves no more than a day or two before planting, keeping the papery skins on. Plant only the biggest cloves — big cloves grow big bulbs — and save the small ones for the kitchen.
- Set each clove pointy end up, 5 cm deep and 10–15 cm apart, in rows about 25–30 cm apart.
- Water once, then mulch with 5–8 cm of straw or shredded leaves to insulate the soil and suppress weeds.
Warning: Don't plant supermarket garlic. It's often treated with sprout inhibitors, may carry soil-borne diseases, and is usually a softneck type bred for a completely different climate. Buy certified seed garlic from a nursery or garden centre.
What happens over winter — and in spring
Underground, roots keep growing whenever soil isn't frozen. A few green tips poking up before the freeze are fine; the mulch protects them. In spring, shoots emerge fast and garlic becomes one of the first green things in the garden. Keep the bed weeded — garlic hates competition — and water in dry spells until the leaves begin to yellow. If you grow hardnecks, snap off the curling flower stalks (scapes) in early summer so energy goes into the bulb; they're delicious sautéed.
When do you harvest?
Roughly eight to nine months after planting: early-to-mid summer, when the lower third to half of the leaves have browned but the top ones are still green. Lift a test bulb — you want plump, well-wrapped cloves. Cure whole plants in a dry, airy, shaded spot for two to three weeks before trimming and storing.
Tip: Log your planting date in PlantMe's garden journal and the app will remind you when scape season and harvest windows approach.
Frequently asked questions
Can I plant garlic in spring?
Yes, but expect smaller bulbs. Plant as early as the soil can be worked, and pre-chill the cloves in the fridge for a few weeks to partially substitute for winter vernalization.
Can I just plant garlic from the supermarket?
It sometimes works, but it's a gamble: supermarket bulbs are often treated to prevent sprouting, can carry disease, and are rarely suited to your climate. Certified seed garlic costs little and yields far more reliably.
My garlic sprouted in autumn — is that a problem?
A few centimetres of green before winter is normal and harmless, especially under mulch. Very tall, lush autumn growth means it was planted too early; mulch generously and it will usually still bulb up fine.
How much should I water garlic?
Barely at all in autumn and winter — one watering at planting is enough in most climates. From spring, water during dry spells, then stop watering entirely in the last few weeks before harvest so bulbs cure well.
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