Planting garlic in autumn is the job that decides next summer's crop, and it happens months before almost anything else goes into the ground. The cloves sit in cold soil all winter, and that cold is not something they merely survive — it is the signal that tells a single clove to divide into a full bulb.

Garlic is genuinely easy to grow. It is only unforgiving about three things: when you plant, how well the ground drains, and which garlic you actually put in the soil. Get those right in October and the rest of the year is mostly waiting.

When to Plant Garlic in Autumn

The rule behind every date below is the same: cloves need enough time to grow roots before the ground freezes, but not so much warm weather that they push up a lot of top growth. Roots before winter, leaves after.

Region / climate	Planting window	What decides the date	Harvest
Atlantic (Cfb)	Mid-October to late November	Wait until soil has cooled below about 15 °C	Late June to July
Continental (Dfb)	Late September to late October	Plant 4–6 weeks before the ground freezes hard	July
Mediterranean (Csa)	November to early December	Wait for the autumn rains to break the summer heat	June

If you are unsure which of these describes your garden, our European climate zones guide explains how to place yourself.

Planting too early is the more common mistake in mild gardens. Cloves put into warm September soil in an Atlantic climate make tall, soft leaves that then sit through winter storms taking damage. Planting too late in a continental garden is the opposite risk: the ground closes up before roots form, and the clove effectively starts from scratch in spring.

Why Garlic Needs a Cold Winter

Garlic splits into cloves in response to a cold period — roughly four to eight weeks below about 10 °C. Without it, the plant grows perfectly happily and then hands you one undivided bulb the size of a shallot, sometimes called a round. It is edible, and it is not what you were hoping for.

This is the whole argument for autumn planting, and it is why an autumn-planted bulb usually beats a spring-planted one on size. Our comparison of autumn garlic vs spring garlic goes through the trade-offs if you are still deciding.

Choose Your Garlic Before You Plant

Do not plant supermarket garlic. It is often treated to stop it sprouting, it is usually grown in a much warmer climate than yours, and it is the standard way gardeners import soil-borne disease into a clean bed. Buy certified seed garlic from a supplier instead.

Then pick a type that matches your winter:

Hardneck suits colder, continental gardens. Fewer but larger cloves per bulb, a stiff central stem, and it produces scapes in early summer. It stores for roughly six months.
Softneck suits mild Atlantic and Mediterranean gardens. More cloves per bulb, no scape, stores nine to twelve months and can be braided.

Break the bulb into cloves on planting day, not days ahead — an exposed basal plate dries out. Plant only the fat outer cloves and cook the small inner ones. Clove size is the single best predictor of bulb size, because a bigger clove carries more stored energy into a winter when the plant cannot photosynthesise much.

Depth, Spacing and Which Way Up

Plant each clove with the pointed end up and the flat basal plate down. Upside-down cloves still grow, but they waste weeks turning themselves around and give you a bent, undersized bulb.

Depth: about 5 cm in mild gardens, 8–10 cm where winters are hard. Deeper planting protects against frost heave lifting cloves out of the ground.
Spacing: 15 cm apart in the row, 30 cm between rows. Crowded garlic gives small bulbs and holds damp air around the leaves, which invites rust.
Handling: push the clove into loose soil, do not screw it in. Compacting the soil directly under the basal plate stops roots pushing down cleanly.

Firm the soil, water once, and leave it alone.

Prepare the Bed Properly

Garlic wants full sun and free-draining ground with a pH near neutral. Wet, heavy soil over winter is the most common reason autumn garlic fails — the cloves simply rot. On clay, plant into a ridge or a raised bed rather than fighting the drainage.

Avoid fresh manure, which pushes soft growth and encourages rot. Compost dug in earlier in the season is fine. Keep garlic off ground that grew onions, leeks or garlic in the last three to four years, because white rot persists in soil for years once it arrives — our crop rotation guide covers how to sequence the allium bed.

Through Winter and Into Spring

Once the soil has cooled in continental gardens, mulch with about 5 cm of straw or shredded leaves. This steadies the soil temperature and reduces frost heave. In mild gardens, green shoots appearing before Christmas are normal and need no protection.

In early spring, pull the mulch back so the soil warms, and feed once with something nitrogen-rich as growth restarts. Keep the bed watered through the bulking weeks of April and May, then stop watering two or three weeks before harvest so the skins dry and the bulbs store. On hardneck types, snap off the curling scapes in June — leaving them on costs you noticeable bulb size, and they are excellent in the kitchen.

What Usually Goes Wrong

Symptom	Likely cause	What to change
One undivided round bulb	Not enough cold, or planted too late	Plant within the window for your zone
Cloves rotted over winter	Waterlogged, heavy soil	Ridge or raised bed, improve drainage
Small bulbs, healthy plants	Cloves planted too close, or scapes left on	Space at 15 cm, remove scapes
Orange pustules on leaves	Rust, worsened by crowding and damp	Wider spacing, rotate the bed
Plants collapse, white fungus at base	White rot in the soil	Four-year allium rotation, do not replant there

How Plantory Helps

Planting garlic in autumn only works if the date fits your own garden rather than a generic calendar. In Plantory you can set your location and frost dates, get the planting window for your climate rather than someone else's, keep the allium bed on a rotation that actually gets followed, and get a reminder next June to cut the scapes and lift the crop at the right moment.

Plan Your Season