How to grow garlic in Australia 🧄

Garlic needs a sustained period of cold to develop a proper bulb. The cloves need cool soil — consistently below about 10°C — to trigger the process that splits a single clove into the individual lobes of a full bulb. Without that cold period, you end up with a fat, undivided round rather than a proper head of garlic.

This is why planting windows vary so dramatically across Australia, and why any guide that just says "plant garlic in autumn" isn't being straight with you.

Start with good quality seed garlic — not supermarket garlic, which is often treated to inhibit sprouting and may be imported from climates completely different from yours. Australian-grown seed garlic from a reputable supplier gives you varieties suited to our conditions and cloves that haven't been chemically treated.

Break the bulb into individual cloves just before planting. Bigger cloves produce bigger bulbs — if you're choosing between two cloves, plant the larger one and eat the smaller one. Don't bother with the small inner cloves from the centre of the bulb.

Spacing: Plant cloves 10–15cm apart in rows 25–30cm apart. Crowding is the most common mistake — garlic needs room underground. You won't see the consequences until harvest, by which point it's too late.

Depth: 3–5cm deep with the pointed end facing up. In cold climates with heavy frosts, go to 5cm to keep cloves from shifting in the soil. In warmer climates, 3cm is plenty.

Orientation matters: Pointed end up. It sounds obvious, but planting upside down is surprisingly common — the clove will still grow, but it wastes energy correcting itself and the bulb will be smaller.

Soil: Garlic needs good drainage. Waterlogged soil causes bulb rot, which you won't notice until you dig up a mushy mess at harvest time. If your soil is heavy clay, raise the bed or dig in plenty of compost before planting. A slightly acidic to neutral pH (6.0–7.0) is ideal.

Mulch: After planting, mulch with straw or sugarcane mulch to keep soil moisture consistent and suppress weeds. Garlic is a poor competitor with weeds — keep the bed clean, especially in the first few months.

Garlic is one of the more pot-friendly vegetables, which makes it a good option for balcony and courtyard gardeners.

In-ground is the lowest-maintenance approach. Once planted and mulched, garlic gets on with things largely on its own through winter. The main consideration is drainage — if your soil is heavy and tends to pool water after rain, it's worth raising the bed slightly or working in compost before planting.

Raised beds are ideal for garlic. The improved drainage, warmer soil, and easy weed control all work in the plant's favour. Even a modest raised bed 20–25cm deep gives garlic what it needs. Raised beds also warm up and cool down slightly faster than ground level, which can nudge the planting window slightly earlier in cool climates.

Pots work well for garlic provided you use a reasonably sized container — at least 25–30cm deep and wide enough to plant several cloves with proper spacing. A half-wine-barrel or a large rectangular planter is ideal. Smaller pots restrict the roots and tend to dry out quickly; garlic needs consistent moisture through winter, not boom-bust watering. Use a good quality potting mix and make sure the pot has drainage holes — sitting water underneath is the main risk. One genuine advantage of pots: you can move them to follow the sun in winter, which matters for garlic more than you'd think.

Garlic needs full sun — a minimum of 6 hours of direct sunlight daily. It won't form decent bulbs in shade. In hot, sunny inland climates, a little afternoon shade in spring won't hurt, but for most of the growing season you want as much direct sun as possible.

Water consistently through the first 4–6 weeks after planting, and through the coldest months when the plant is building its root system. As spring arrives and the leaves start to yellow and fall over, reduce watering significantly — the outer skin of the bulb is drying and hardening at this stage, and excess moisture leads to rot and reduces storage life. Stop watering entirely in the 2–3 weeks before harvest.

You'll know garlic is ready when around half the leaves have yellowed and fallen over — typically 5–6 of the lower leaves have dried back, with 5–6 green leaves still standing. Don't wait for all the leaves to die back completely; by then the outer skin of the bulb has usually split, and a split-skin bulb won't store well.

Timing from planting varies by variety and climate: roughly 5–6 months for most zones. In cooler climates this is typically October to November. In subtropical zones, expect August to September.

Dig carefully with a fork rather than pulling from the stem — the neck is brittle when fresh and snaps easily. Slide the fork under the bulb and lever it out.

Curing is the step most home gardeners skip, then wonder why their garlic goes soft within a month. Lay the harvested bulbs — leaves still attached — in a single layer in a dry, shaded, well-ventilated spot for 3–4 weeks. A shed with open sides or a covered verandah works well. The outer skin will dry and tighten, and the neck will dry out completely. Only then cut the stems and store.

Storage: Properly cured garlic kept in a cool, dry, dark spot will last 6–10 months for hardneck varieties and up to 12 months for softneck. Don't store in the fridge — the cold temperatures will trigger sprouting.

White rot is the disease garlic growers fear most. It's a soil-borne fungus that causes the roots and base of the bulb to rot, with white fluffy growth appearing at soil level. The devastating part: once white rot is in your soil, it can survive for 20 years or more. There's no effective treatment once it's established. Avoid it by sourcing clean seed garlic, rotating your crops (don't plant garlic, onions, or chives in the same bed more than once every four years), and not bringing soil from other gardens in on tools or boots. If you suspect white rot, remove and dispose of affected plants — don't compost them.

Rust is a fungal disease that shows up as orange-yellow pustules on the leaves, most commonly in humid coastal climates — coastal NSW, Queensland, and WA's southwest. It won't kill the plant but it weakens it and can reduce bulb size. Remove badly affected leaves, improve air circulation between plants, and avoid watering from overhead. In persistently humid climates, plant a little later in the season so the plant matures during drier conditions.

Small or undivided bulbs are usually a sign of one of three things: planted too late in the season so the plant didn't get enough cold, planted too close together, or harvested too early. In subtropical climates, smaller bulbs are common and reflect a genuinely shorter cold window — try pre-chilling your seed cloves in the fridge for a few weeks before planting next season.

Plant near: Roses (widely planted near roses and thought to deter aphids — many rose growers swear by it, though the evidence is anecdotal), chamomile, beetroot, and most brassicas including broccoli, cabbage, and kale.

Keep away from: Peas and beans. Garlic and all its allium relatives release compounds that inhibit the soil bacteria that legumes depend on to fix nitrogen. Plant them near your beans and you'll get noticeably smaller, less productive plants. Keep at least a full bed's width between them.

Monaro Purple — A hardneck variety from the Southern Tablelands of NSW. Rich, full flavour with a slight heat. Suits cool temperate and cool/cold climates best; a good choice for subtropical zones where you need a variety that performs well with a shorter cold period. 8–12 cloves per bulb.

Australian White — A softneck variety widely grown across southern Australia. Milder flavour, very long storage life (up to 12 months). A good all-rounder for warm temperate climates like Sydney, Perth, and Adelaide. Available from most Australian seed suppliers.

Printanor — A French softneck variety that has naturalised well in Australian conditions. Strong flavour, consistent bulb size, reliable in most zones except tropical. Long shelf life. Popular with market gardeners in Victoria and SA.

Purple Stripe — Several purple-striped hardneck varieties perform well in cool temperate and cold climates. More complex flavour than softnecks, better eaten fresh than stored long-term. Worth trying if you're in Melbourne, Hobart, or Canberra and want flavour over storage life.

Elephant garlic — Technically a leek relative rather than true garlic, but worth mentioning. Much larger bulbs, much milder flavour. Easier to grow across a wider range of climates including subtropical zones. A good option if you're in Darwin or Brisbane and want something in the garlic family without the strict cold requirement.