How to Grow Garlic in Containers on a Balcony

Garlic might be the most satisfying thing you can grow in a pot, and almost nobody tries it. You plant it in fall, when everything else is winding down, walk away for most of the winter, and dig up fat homegrown bulbs the following summer. It asks less of you than a tomato and gives you something you’ll actually cook with all year.

You don’t need a yard. You don’t need a raised bed. A deep pot on a balcony grows garlic just fine — I’ve done it for six years running on a small Portland-area balcony, and the bulbs are every bit as good as any I’ve bought.

Here’s how to plant it this fall.

You’ll also want a bag of fresh, free-draining potting mix — not garden soil, which packs down hard in a pot and holds too much water for garlic. I don’t have a bagged mix in a listing I’d stand behind to link yet, so pick up a good peat-free or compost-based container mix locally, and I’ll add one here when I’ve found one I trust.

Buy seed garlic, not the grocery store kind

This is the one thing worth doing right, and it’s easy. Buy “seed garlic” — bulbs sold specifically for planting — from a garden center, a seed company, or a farmers market. Supermarket garlic is often treated to stop it sprouting, and it’s usually a variety grown for a warm climate that won’t do well for the rest of us. Seed garlic costs a little more, but you plant it once and it’s worth it.

There are two families to choose from, and the choice is simple.

Hardneck garlic handles cold winters and gives you a bonus crop of garlic scapes in spring. If your winters actually freeze, grow hardneck. Softneck garlic prefers milder winters, stores longer, and is the type you can braid. I’m in a mild Pacific Northwest climate, so I can grow either, and I usually plant one pot of each. Ask at your garden center which does well where you live — it’s the kind of thing they love to answer.

Pick a pot with real depth

Garlic isn’t fussy about much, but it does want room to send roots down.

Choose a container at least 8 to 10 inches deep, and honestly, deeper is better for how the roots run. Width just decides how many cloves you can fit — space them about 6 inches apart in every direction, so a 12-inch pot holds four or five cloves and a longer grow bag holds a whole row. Whatever you use, it must have drainage holes. Garlic sitting in waterlogged mix over winter will rot, and that’s the number one way a container crop fails.

This is exactly why I grow mine in fabric grow bags. The fabric drains freely and lets air to the roots, so the mix never turns into a cold, soggy brick the way it can in a solid plastic pot over a wet winter.

Plant in fall, pointy end up

Timing is the thing beginners worry about most, and it’s forgiving. You want to plant in fall, a few weeks before your ground would normally freeze, so the cloves grow roots and maybe a small green shoot before winter, then go quiet until spring. For most of us that’s sometime in October; in a mild climate you have until November.

Right before planting, break the bulb into individual cloves, and leave the papery skin on each one. Plant only the fat, healthy outer cloves — save the tiny inner ones for the kitchen, because a small clove makes a small bulb. Push each clove pointy end up, flat root-end down, about 2 inches deep, and firm the mix over it.

Get the clove upside down and it’ll still try to grow, just crooked and weaker. Pointy end up. That’s the whole secret.

Water it in well with the long-spout watering can, and if you have a little straw or shredded leaves, a light mulch on top helps hold moisture and buffers the cold. Then, mostly, you leave it alone.

Carry the pot through winter

Winter garlic care is the easiest gardening there is, because it’s almost all “don’t.”

Don’t overwater. A pot outside in the rain often needs no help at all, and a covered balcony pot needs just enough to keep the mix barely damp, never wet. This is where a soil moisture meter earns its keep — push the probe to root depth and only water when it truly reads dry, which in winter might be once every couple of weeks. Cold plus soggy is what rots the cloves; cold plus barely-damp is exactly what garlic wants.

If you get hard freezes, tuck the pot against a sheltered wall or group it with your other containers so they insulate each other. Garlic is tough — a little green shoot poking up before winter is fine, and it’ll pause and wait out the cold. You may see nothing at all for weeks, and that’s normal. It’s working underground.

Spring feeding, scapes, and the summer harvest

When the days lengthen in spring, your garlic wakes up and starts growing in earnest. That’s when it wants feeding — I give mine a nitrogen-forward liquid feed every couple of weeks through spring to push good leafy growth, because the leaves are what build the bulb.

If you planted hardneck garlic, it’ll send up a curling flower stalk in late spring — the scape. Snap those off while they’re tender and curled. It sends the plant’s energy back down into the bulb, and the scapes themselves are a treat, mild and green, wonderful chopped into a stir-fry or blitzed into a pesto.

Harvest comes in early-to-mid summer, and the plant tells you when. Watch the leaves: when the lower third have gone brown and dry but there are still five or six green leaves up top, it’s ready. Stop watering for a week or so, then gently loosen the mix and lift the bulbs — don’t yank them by the stalk. Brush off the dirt, and cure them somewhere dry and airy, out of direct sun, for a few weeks before you trim them. Cured properly, softneck garlic will keep for months.

Otto, for the record, is deeply suspicious of the garlic pots and gives them a wide berth, which is the one and only time all year he leaves a container of mine completely alone.

I lay out the whole small-space system — pot sizes, mixes, and what to grow in every season, including a proper year-round plan — in Small-Space Big Harvest. This post is the garlic question. The book is how you keep a space smaller than a yard producing something worth eating all the way around the calendar.