Quick answer
Plant healthy cloves from a named garlic variety in full sun and free-draining soil, normally in autumn where winters provide the cold exposure needed for good bulb division. Set each clove pointed end upward, keep the bed weed-free and water during prolonged spring drought. Stop watering as bulbs approach maturity, then lift when several lower leaves have browned but enough green leaves remain to protect the wrappers.
Cure whole plants in a dry, shaded, airy place before trimming. Hardneck and softneck garlic differ in scape production, clove arrangement, climate adaptation and storage life, so choose the type before deciding how much to plant.
Hardneck, softneck and planting stock
Hardneck garlic forms a rigid central flower stalk called a scape and usually produces fewer, larger cloves. It generally performs well in colder winters but stores for a shorter period. Softneck garlic usually has more cloves, lacks a rigid scape, can be braided and often stores longer.
The RHS garlic guide recommends named planting stock rather than supermarket bulbs, which may be poorly adapted or carry disease. The University of Minnesota Extension similarly stresses climate-adapted planting material.
Elephant garlic is not true garlic; it is a leek relative with very large, mild cloves. Its spacing, maturity and flavour differ enough that it should not be substituted directly into this guide.
Site, soil and timing
Select a sunny bed that does not remain wet in winter. Garlic needs moisture in active spring growth but dormant cloves can rot in saturated ground. A raised bed is useful where drainage is marginal.
Aim for a tested pH around 6.0–7.0 and incorporate mature compost before planting. Garlic responds to fertile soil but excess late nitrogen delays bulb maturity. Avoid ground recently used for onions, leeks or garlic when rotation is practical.
Autumn planting lets cloves root before winter and provides natural cold exposure. In very wet or severe climates, locally recommended spring planting may be safer. The right date is late enough to limit excessive top growth but early enough for roots to establish before hard freezing.
Planting cloves and containers
Separate bulbs into individual cloves shortly before planting so the basal plate does not dry. Keep the papery skin intact. Plant the largest sound cloves and use small or damaged ones in the kitchen.
Set cloves upright, usually 15–20cm apart, with the pointed tip covered to the depth advised for the local climate. Deeper planting gives more frost protection; very deep planting in heavy wet soil can slow emergence and increase rot.
Garlic can grow in a container at least 30cm wide, but the compost must drain freely through winter. Space about six cloves in a broad 15-litre container rather than crowding an entire bulb's worth. Pots are more exposed to freeze-thaw cycles than garden soil, so protect the container without moving hardy garlic into a warm room.
Watering, weeds and feeding
Garlic has narrow leaves and does not shade weeds effectively. Weed early and shallowly to avoid cutting bulbs. A clean straw or leaf mulch can moderate winter temperatures and suppress weeds; pull it back if it keeps heavy soil persistently wet.
Water deeply during dry spring weather. Reduce and then stop irrigation as lower leaves brown and harvest approaches. Wet foliage and necks late in the cycle increase the risk of staining and disease.
Use a soil test for nutrient decisions. Where nitrogen is needed, supply it during active leaf growth rather than after bulbs are swelling. Each healthy leaf helps form a protective wrapper around the mature bulb.
Scapes and bulb development
Hardneck plants normally produce scapes. Cut them after they curl but while still tender if the objective is maximum bulb size; they are edible. Leaving some scapes is useful when observing maturity or saving bulbils, though bulbils take longer than cloves to produce full-sized bulbs.
Do not uncover swelling bulbs or bend foliage. Bulb division occurs below ground and depends on variety, temperature and day length. A single round bulb can result when cold exposure or season length was insufficient; it remains edible and can sometimes be replanted.
Diagnosing common problems
| Symptom | Likely causes to investigate | First checks |
|---|---|---|
| Bulb remains one round clove | Insufficient cold exposure, late planting or variety mismatch | Winter temperatures and planting date |
| Leaves yellow early | Waterlogging, nutrient stress, onion fly or disease | Roots, soil moisture and symptom pattern |
| White fluffy growth at bulb base | White rot or another basal disease | Sclerotia, smell and spread in the bed |
| Bulb splits before harvest | Harvest delayed or uneven moisture | Leaf stage and wrapper condition |
| Small bulbs | Small planting cloves, shade, weeds or drought | Stock size, competition, sun and spring water |
| Brown scars on cloves | Bulb mites, disease or physical injury | Magnification, storage humidity and source stock |
White rot persists in soil for years, so suspected cases warrant confirmation through a regional diagnostic service before moving soil or planting stock. Do not save cloves from diseased bulbs.
Harvest, curing and storage
Begin checking when lower leaves brown while roughly half the leaves remain green. Lift one bulb and examine whether cloves fill their skins. Waiting until every leaf is brown can leave too few intact wrappers and cause cloves to separate in the soil.
Loosen bulbs with a fork and handle them gently; fresh garlic bruises easily. Do not wash storage bulbs. Cure complete plants under cover with strong airflow and no direct sun for several weeks, then trim roots and tops after necks and wrappers are dry.
Keep the largest healthy bulbs as next season's planting stock. Store eating garlic cool, dry and ventilated. Softneck types usually last longer; use damaged, split and hardneck bulbs first.
Sources and review basis
- How to grow garlic — Royal Horticultural Society
- Growing garlic in home gardens — University of Minnesota Extension
Cold requirements and planting depth vary by climate and cultivar. Locally adapted planting stock and regional guidance take precedence over calendar dates.