When to plant garlic, and why fall wins

Plant garlic in fall. Aim for a few weeks before your ground freezes. In many parts of the US, that lands in mid-fall. Where winters are mild, it can be later. Where winters come early, it can be earlier.

That is the answer. Here is why it works, and why the cold is not something to protect your garlic from. Cold is part of the recipe.

Why fall beats spring

Garlic wants a long season. It wants to root in cool soil, sit through winter, and then grow fast when spring arrives.

Most hardneck garlic, and many softnecks, need a stretch of cold to form a proper bulb with separate cloves. Gardeners call this vernalization. Skip the cold and you often get a single round bulb, or a small head with tiny cloves. Edible, yes. What you wanted, usually not.

Fall planting gives the clove time to put down roots before the ground locks up. Those roots are the head start. In spring, the plant is already anchored and ready to go while spring-planted cloves are still waking up.

Spring planting can work. It is the backup plan, not the main one. If you missed fall, some growers chill cloves in the fridge for several weeks before planting to fake a winter. Results vary.

How to find your window

Your climate decides the date. Not the calendar on a seed packet. Not a national garden center ad.

• Find your average first hard freeze. Your local cooperative extension office is the best source. So are experienced gardeners down the road.
• Count back a few weeks. That is your target.
• Watch the soil, not just the air. You want cool soil that is still workable.
• In mild-winter regions, the ground may never freeze hard. There, planting often happens later in fall or into early winter, once the soil has cooled.

Plant too early and garlic may push a lot of green top growth before winter. That top can get burned back. Plant too late and the roots don't get established. A few weeks of rooting time is the sweet spot.

How to plant it

This part is simple, and it goes in order. No kit is needed.

• Start with good seed garlic. Grocery store garlic is sometimes treated to stop sprouting, and it may be a variety suited to a different climate. Seed garlic from a local grower or a neighbor who grows it well is a safer bet.
• Break the head into cloves just before planting. Keep the papery skins on. Plant the biggest cloves. Big clove, bigger bulb.
• Pointy end up. Flat root end down. This matters.
• Set each clove a few inches deep. Space them several inches apart in the row, with room between rows to weed.
• Use loose, well-drained soil. Garlic hates sitting in water over winter. Heavy clay? Work in compost or plant in a raised bed.
• Water once after planting if the soil is dry. Then let the weather do its job.

Mulch, then leave it alone

After planting, cover the bed with mulch. Straw or shredded leaves work well. Use what you have. Fall leaves are free.

Mulch is not there to keep the garlic warm. It is there to keep the soil temperature steady. Freezing and thawing over and over can heave cloves out of the ground. A good layer of mulch evens that out. It also smothers weeds in spring, and garlic does not compete well with weeds.

Then walk away. You may see green shoots before winter. That is normal. Don't panic. Don't cover them with plastic. Don't dig them up to check.

What happens next

In spring, the shoots grow fast. Pull back mulch if it's too thick for them to push through. Keep weeds down. Water during dry spells.

Hardneck types send up a curly flower stalk called a scape. Many growers cut it off so the plant puts more energy into the bulb. Scapes are good eating.

Harvest usually comes in early to midsummer, when the lower leaves start browning. Timing again depends on where you live. Dig, don't yank. Cure the bulbs somewhere dry and airy before storing.

The short version

• Plant in fall, a few weeks before your ground freezes.
• Your climate sets the date. Check with local sources.
• Cloves pointy end up, a few inches deep.
• Mulch after planting.
• Let winter do the work.

Most garden chores are about protecting plants from the weather. This one is the opposite. Garlic needs the winter. Give it one.