Planting Garlic: Autumn vs Spring

For most UK gardens, autumn is the best time to plant garlic — ideally October or November. Garlic needs a decent cold spell to split into a proper, multi-clove bulb, and an autumn planting gives it the long, chilly winter it's looking for. Spring planting (February to March) is a perfectly good fallback if you missed the autumn window or you garden somewhere very wet, but you'll want to choose varieties bred for it, and the bulbs are often a touch smaller.

This guide explains why that cold requirement matters, exactly when each window opens, which varieties suit autumn versus spring, and a simple method that works either way. For everything else — soil, feeding, harvesting and storing — see the full garlic growing guide.

Why garlic needs cold (vernalisation)

Garlic is an allium, the same family as onions and leeks, and it has one quirk that catches beginners out: it needs to be cold for a while before it will form a good bulb. This cold trigger is called vernalisation.

Here's the simple version. When you plant a single clove, it doesn't just swell into one big clove — you want it to divide into a whole bulb of cloves. Garlic only reliably does that division if it has spent several weeks at around 0–10°C. Without enough cold, the clove tends to grow into one round, undivided bulb (a "round") rather than the segmented bulb you're after.

That's the whole reason autumn planting works so well in the UK. Plant in October or November and the clove roots down, sits through the winter cold, and gets all the vernalisation it needs naturally. By the time it powers into growth in spring, it's already been told to make a proper bulb.

This also explains why supermarket garlic is a poor bet for planting. Much of it is grown in warmer climates, may not be suited to UK conditions, and can carry diseases such as white rot. Buy certified seed garlic from a reputable supplier instead — it's clean, named, and bred for our climate.

Autumn planting (October–November)

Autumn is the default choice for the UK, and for good reason.

The window: plant from mid-October to late November, once the summer heat has gone but before the ground turns into a quagmire. In milder southern gardens you can stretch into early December; in colder or wetter northern and upland gardens, aim for October so the cloves root before the worst of the wet arrives.

Why it's better for most people:

• The cloves get a full, natural cold spell — proper vernalisation, no fuss.
• A longer growing season means more time to bulk up, so bigger bulbs.
• Autumn-planted garlic is usually ready to harvest from June, earlier than spring-planted.

Best autumn (hardcraft) varieties for the UK:

• 'Solent Wight' — a softneck that stores extremely well, often into spring. A reliable all-rounder.
• 'Early Purple Wight' — the earliest to harvest, sometimes from late May. Doesn't store as long, so eat it first.
• 'Elephant Garlic' — technically more of a leek relative, with huge mild cloves. Plant in autumn for the biggest results.
• Hardneck types such as 'Lautrec Wight' — stronger flavour and a flower stalk (scape) you can eat, though they store for less time than softnecks.

Getting it through winter: garlic is genuinely hardy and copes with frost and snow without protection. The real enemy in a UK winter isn't cold — it's waterlogging. Cloves sitting in cold, sodden soil are prone to rotting. If your soil is heavy, plant into a raised bed, add grit to improve drainage, or start cloves in modules in a cold frame and plant them out in spring once rooted.

It's worth knowing when your area typically gets its first hard frosts, so you can plant with enough time to root beforehand. The frost-date checker gives you a local steer, and the planting calendar lays the whole garlic year out month by month.

Spring planting (February–March)

Missed autumn? Don't panic — spring planting is a real option, not a consolation prize.

The window: plant from late February to the end of March, as soon as the soil is workable (not frozen, not a sticky mess). The earlier you can get them in, the more cold they'll catch at the tail end of winter, which helps with that all-important vernalisation.

When spring planting makes sense:

• You simply didn't get round to it in autumn.
• Your soil is very heavy and wet over winter, and you'd rather not risk cloves rotting in the ground.
• You're gardening in a particularly cold, exposed spot where autumn losses can be high.

The catch is the shorter growing season. Spring-planted garlic has less time to bulk up before it naturally dies back in mid to late summer, so bulbs are often a little smaller. They'll still be perfectly good to eat — just don't expect record-breakers.

Best spring varieties for the UK:

• 'Solent Wight' — flexible enough to plant in either season, which is why it's such a popular first choice.
• 'Picardy Wight' — a softneck that performs well from a spring planting and stores well.
• 'Cristo' — a dependable softneck suited to spring and a good cropper.

To give spring cloves the best start, you can pop them in the fridge (in the salad drawer, around 4°C) for a few weeks before planting. This "tricks" them into thinking they've had more winter, nudging better bulb division. It's optional, but it helps if you're planting a variety that usually prefers autumn.

Which should you choose?

For the quick decision, line it up against your own plot:

• Plant in autumn if you have free-draining soil, you want the biggest bulbs, and it's currently October or November. This is the right call for most UK gardeners.
• Plant in spring if you missed autumn, your soil is heavy and wet over winter, or you garden somewhere cold and exposed where autumn losses are likely.

You don't have to commit to one forever, either. Plenty of growers plant a flexible variety like 'Solent Wight' in autumn for the main crop, then put a few spare cloves in during spring as a backup — spreading the harvest and the risk. If you grow onions too, you'll notice the same logic at play: autumn sets (or here, cloves) get a head start, spring ones catch up later in the season.

Quick how-to, either season

The planting method is the same whichever window you use — only the calendar changes.

1. Split the bulb into individual cloves just before planting. Use the biggest, fattest cloves for planting (bigger clove, bigger bulb) and keep the small inner ones for the kitchen.
2. Prepare the ground. Garlic likes an open, sunny spot and free-draining soil that isn't freshly manured. Work in some compost if your soil is poor; if it's heavy, add grit or use a raised bed.
3. Plant each clove pointy end up, about 2–5cm deep, so the tip sits just below the surface. Space cloves 15cm apart, with 30cm between rows.
4. Firm in and leave well alone. Birds sometimes tug newly planted cloves out — a net or some twiggy sticks over the row sorts that.
5. Keep it weed-free through the season; garlic hates competition. Water in a dry spring, but stop watering once the leaves start to yellow ahead of harvest.
6. Harvest when the lower leaves have gone yellow-brown but the tops are still green — usually June to July from autumn planting, a little later from spring. Lift gently with a fork and dry the bulbs in an airy, dry spot before storing.

For the full detail on feeding, common problems and curing bulbs for storage, head back to the main garlic guide. Garlic is one of the most forgiving crops you can grow — get the timing roughly right and the UK winter does most of the hard work for you.