Garlic is one of the easiest and most rewarding crops to grow in the UK, offering a rich flavour that no shop-bought bulb can match. With the right timing and care, you can harvest plump, healthy bulbs almost year-round, and growing under a polytunnel makes it even more reliable.
When to Plant Garlic in the UK
Garlic is best planted in the cooler months, as many varieties need a period of cold to form good bulbs.
- Autumn planting: Sow from October to December for the strongest bulbs. This is the traditional time and suits most hardneck and softneck varieties.
- Spring planting: If you miss autumn, you can still plant cloves in February–March, though bulbs are often smaller.
- Under cover: In a polytunnel, autumn planting is much more dependable, protecting cloves from frost, waterlogging, and pests.
How to Grow Garlic in the UK
- Soil: Garlic prefers light, well-drained soil enriched with organic matter. Avoid waterlogged conditions, which cause rot.
- Planting depth: Push individual cloves 2–3cm below the surface, pointed end up.
- Spacing: Plant cloves 10–15cm apart in rows 30cm apart.
- Watering: Keep soil moist in spring and early summer, but reduce watering as bulbs mature.
- Feeding: A general-purpose fertiliser or a high-potash feed during growth helps strengthen bulbs.
Hardneck vs Softneck Garlic
Choosing the right garlic type makes a big difference:
- Hardneck: Stronger flavour, produces scapes (edible flower stalks), but slightly shorter storage life. Best suited for colder areas of the UK.
- Softneck: Milder flavour, stores for months, and tends to produce more cloves per bulb. Ideal for most UK gardens.
Many UK growers plant a mix of both for variety and reliability.
Garlic Companion Plants
Garlic has natural pest-repelling properties, making it a great companion in the garden.
- Good companions: Strawberries, carrots, beetroot, and lettuce. Garlic helps deter aphids and carrot fly.
- Avoid planting near: Beans and peas, which may struggle alongside garlic’s strong growth.
Garlic in Containers and Pots
No garden? No problem. Garlic grows well in pots as long as you choose a container at least 20–30cm deep.
- Space cloves 10cm apart.
- Use free-draining compost.
- Keep watered, as pots dry out faster.
Polytunnels make container growing even more reliable by keeping soil warm and dry through winter.
When to Harvest Garlic in the UK
Garlic is usually ready from June to August, depending on when you planted it.
- Signs it’s ready: Leaves begin to yellow and flop over.
- Lift bulbs gently with a fork rather than pulling by hand.
- Dry bulbs in a sunny, well-ventilated spot for 1–2 weeks before storing.
Tip: Don’t wait too long — if the wrappers split in the soil, bulbs won’t store well.
Best Garlic Varieties for the UK
Some of the most popular varieties include:
- Softneck: Provence Wight, Early Purple Wight, Solent Wight.
- Hardneck: Carcassonne Wight, Chesnok Red.
- Elephant garlic: Not a true garlic, but a mild-flavoured, giant relative of the leek.
Quick Tips Recap
- Planting time: October–December (best), or Feb–Mar.
- Spacing: 10–15cm between cloves.
- Harvest: June–August.
- Polytunnel advantage: Protects cloves from frost and waterlogging, improves reliability.
FAQs
Plant garlic in autumn (October–December) for the best results. Spring planting (February–March) is possible but usually produces smaller bulbs.
Hardneck garlic has a stronger flavour and produces edible scapes but stores for less time. Softneck garlic is milder, stores longer, and usually has more cloves.
Yes — garlic grows well in pots at least 20–30cm deep. Space cloves 10cm apart, use free-draining compost, and keep watered during dry spells.
Garlic is typically ready from June to August. Harvest when the leaves begin to yellow and flop over, then dry bulbs before storing.
Popular choices include Solent Wight and Provence Wight (softneck) and Carcassonne Wight or Chesnok Red (hardneck). Elephant garlic is also widely grown for its mild flavour.
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