Garlic is best planted in the UK during October and November. Planting in autumn gives the cloves time to establish roots and exposes them to the cold period needed for reliable bulb development. In mild areas, planting can continue into early winter as long as the soil is workable and not waterlogged.
For most garden and allotment crops, plant individual cloves with the pointed end upwards, about 15 cm apart, with around 30 cm between rows. A useful planting depth is to leave roughly 2.5 cm of soil above the tip of the clove.
| Main planting time | October–November |
| Cold period | around 1–2 months at 0–10°C |
| Clove spacing | about 15 cm |
| Row spacing | about 30 cm |
| Planting depth | tip around 2.5 cm below soil surface |
| Position | full sun, fertile free-draining soil |
When is the best time to plant garlic in the UK?
October and November are the main planting months. The soil is usually still warm enough for root growth, while the colder weather that follows provides the chilling garlic needs before spring growth begins.
There is no need to plant on a fixed calendar date. A dry, workable bed in late November is usually a better option than forcing cloves into saturated soil several weeks earlier.
In areas with relatively mild autumns, garlic can also be planted in early winter. The main limitation is soil condition rather than the date itself. Avoid planting into frozen or waterlogged ground.
Why does garlic need a cold period?
Garlic needs more than time in the soil. Most varieties require a period of low temperature before they form a normal bulb divided into separate cloves.
A useful reference point is around one to two months at temperatures between 0 and 10°C. This cold exposure triggers the developmental changes that allow the bulb to divide properly later in the season.
If garlic does not receive enough chilling, it may produce a single rounded bulb rather than a head made up of individual cloves. These are often described as rounds or solo bulbs.
The purpose of autumn planting is not simply to protect garlic from winter. Cold acts as a developmental signal that helps the plant form a properly divided bulb.
Can garlic be planted in spring?
Yes. Some varieties are suitable for planting in late winter or early spring, so missing the autumn planting window does not automatically mean losing the crop.
Spring planting can also be useful where winter soil is extremely wet. On heavy clay, it may be better to start cloves in modules and keep them in an unheated greenhouse or cold frame rather than leave them sitting in saturated ground.
Autumn planting remains the standard option for most UK gardens because it gives the crop a longer growing period and provides the cold treatment naturally.
How deep should you plant garlic cloves?
Plant each clove with the flat basal plate at the bottom and the pointed end facing upwards. As a general rule, leave about 2.5 cm of soil above the tip.
Depth recommendations can appear inconsistent because some guides measure from the soil surface to the top of the clove, while others describe the total depth of the planting hole. Checking what is actually being measured avoids unnecessary confusion.
On light, free-draining soil, cloves can be planted somewhat deeper. On heavy clay, excessive depth combined with winter wet increases the risk of poor establishment and rotting.
How far apart should garlic be planted?
A spacing of around 15 cm between cloves gives individual plants enough room to develop full-sized bulbs without excessive competition.
Leave about 30 cm between rows. This provides reasonable access for weeding and makes it easier to inspect the crop during the growing season.
Planting more closely can increase the number of plants in a bed, but it also increases competition for water, nutrients and light. If large bulbs are the priority, overcrowding is rarely useful.
What soil does garlic need?
Garlic performs best in fertile, free-draining soil in full sun. The crop needs moisture while establishing and during active growth, but it does not tolerate prolonged waterlogging well.
This matters particularly over winter. Heavy clay can remain saturated for long periods, which reduces the amount of air around the roots and increases the risk of damaged or rotting cloves.
Where drainage is poor, a raised bed can be more useful than simply planting deeper. Another option is to start the cloves in modules and plant them out once soil conditions improve.
Hardneck or softneck garlic?
Both hardneck and softneck garlic are widely grown, but they behave slightly differently.
| Type | Typical characteristics |
|---|---|
| Hardneck | usually produces fewer, larger cloves and a flower stalk or scape; generally stores for a shorter period |
| Softneck | usually produces more cloves and tends to store for longer |
The distinction is useful when choosing seed garlic, but planting requirements are broadly similar. The individual variety and its recommended planting season matter more than the hardneck or softneck label alone.
Can you plant supermarket garlic?
A supermarket clove may grow, but named seed garlic from a reputable supplier is a better choice for establishing a crop.
Garlic sold for eating may be an imported variety selected for storage and appearance rather than performance in local growing conditions. Planting material can also carry pests or diseases into a vegetable plot.
Separate bulbs into individual cloves shortly before planting. Use firm, healthy cloves and keep the dry skin around each one intact.
Do not ignore drainage just to plant on time
One of the most useful adjustments for UK conditions is to treat soil condition as part of the planting date. Garlic benefits from autumn planting, but cloves left in cold, saturated soil are not being given a better start simply because they were planted earlier.
On heavy ground, improve drainage, use raised beds or start cloves in modules. A slightly later planting into suitable soil is often preferable to planting into mud.
Watch for onion white rot
Garlic shares several soil-borne problems with onions, leeks and other alliums. One of the most serious is onion white rot.
Ordinary crop rotation is good practice, but it is not a reliable solution once white rot is established. The pathogen can survive in contaminated soil for many years, so repeatedly moving garlic around the same small allotment does not remove the risk.
Do not move contaminated soil between beds on tools, boots or plant material. If white rot has previously been confirmed in a plot, that history is more important than simply counting the number of years since garlic was last grown there.
Newly planted garlic can also need physical protection
Birds sometimes pull recently planted cloves from loose soil before they have rooted properly. Netting or horticultural fleece can protect a newly planted bed until the cloves are established.
In areas where allium leaf miner is a problem, insect-proof mesh can also be useful during adult flight periods. The pest attacks garlic as well as onions, leeks and shallots, so protection needs to be planned across the whole allium bed rather than for garlic alone.