Can You Grow Garlic from a Supermarket Bulb?
You can plant a clove from a shop-bought bulb — but the results are a gamble. Here is what might stop it growing, and why seed garlic is the safer choice.
Quick answer
You can try, but supermarket garlic often disappoints
- Possible problems
- Treated cloves, varieties unsuited to your climate, and disease.
- If you try
- Plant single cloves, point up, in autumn or early spring.
- Better route
- Buy certified seed garlic from a garden supplier.
- Why
- Seed garlic is disease-free and chosen for your conditions.
Why supermarket garlic is a gamble
Garlic is grown from cloves, not seed, so in theory any clove can become a new bulb. In practice, shop-bought garlic has three strikes against it:
- It may be treated. Some imported garlic is treated to stop it sprouting on the shelf, and treated cloves may never grow.
- The variety may not suit you. Much supermarket garlic is a softneck type grown in a milder climate; in a cold, wet garden it can struggle.
- It can carry disease. Imported bulbs may bring in problems such as white rot, which can persist in the soil for years — the main reason the RHS recommends certified stock.
None of these means it will definitely fail — many people plant a spare clove and get a bulb — but it is a lottery rather than a reliable crop.
If you want to try it
Treat it as an experiment, keep it away from your main garlic bed, and follow the basic rules:
- Break the bulb into single cloves. Leave the papery skin on.
- Plant each clove point-up, about 2–3 cm deep and 10–15 cm apart.
- Choose the right season. Many garlics are planted in autumn for a summer crop; in cold areas, spring planting is safer.
- Choose a sunny, free-draining spot. Garlic rots in waterlogged soil.
- Isolate it from your main crop so any disease does not spread.
The disease risk is the real one
White rot and similar soil diseases are very hard to eradicate once in a garden. That is why the guidance is to plant certified cloves rather than shop-bought ones.
The better route: seed garlic
"Seed garlic" is simply garlic sold for planting — certified free of the worst diseases and chosen for growing conditions like yours. It costs a little more but saves a season of disappointment, and you can save your own cloves from it year after year. Buy hardneck types for cold winters and softneck types for milder climates, and order in good time for autumn planting.
How garlic grows, so you know what to expect
Garlic is grown from a single clove, which swells into a new bulb of many cloves over one season. That means one clove gives one bulb, not a whole row — useful to know before you plant a whole supermarket bulb in hope of a big crop.
- Autumn planting suits most climates: roots establish over winter and the bulb matures the following summer.
- Spring planting suits cold, wet gardens where autumn cloves might rot; bulbs are often smaller.
- Harvest when the lower leaves yellow and the tops begin to fall over — usually in summer.
- Cure before storing by drying the bulbs somewhere airy, then keep them cool and dry.
What to do with the bulbs you harvest
Home-grown garlic is usually eaten long before it needs storing, but dived bulbs keep best in a cool, dark, airy place rather than a sealed drawer. Keep the biggest, healthiest bulbs back as your own planting stock for next autumn, and eat the rest first. If you started from treated or imported supermarket cloves and the crop is poor, buying certified seed garlic next time is the simplest fix.
Common problems, and what they mean
| Problem | Likely cause |
|---|---|
| Cloves never sprout | Treated or old garlic; too wet or too cold |
| Yellow, stunted plants | Poor drainage or low fertility |
| Bulbs split into "rounds" | Cold shock or planting too early |
| Rot at the base | Waterlogging, or soil disease such as white rot |
Most garlic disappointments come back to drainage and disease. Plant in free-draining soil, avoid planting where alliums have grown recently, and start from certified cloves if you want to avoid the disease question altogether.
Frequently asked questions
Why didn't my supermarket garlic sprout?
It may have been treated to prevent sprouting, or the clove may have been stored too long. Not all treated garlic fails, but results are unreliable.
Can I grow garlic from a clove that has already sprouted in the cupboard?
You can plant it, and it may well grow — a green shoot shows the clove is alive. Keep it isolated from other alliums and expect a smaller bulb.
When should I plant garlic?
Most garlic is planted in autumn for a summer harvest, though spring planting suits cold, wet gardens. Follow the guidance for your climate.
Tools for this guide
Related guides
- How to Grow Sweet Potato Slips from a Shop Tuber
- Can You Really Grow Ginger from a Supermarket Rhizome?
- How to Regrow Spring Onions in Water (and What Really Happens)
Sources and research notes
This guide reflects UK horticultural guidance on growing garlic, including the recommendation to plant certified stock rather than supermarket cloves.
Written and edited by the Seedledge Editorial. Every guide answers one real growing question, is checked against the sources listed above, and is updated when guidance changes. We are an independent editorial desk, not horticultural professionals — read how we research and update our guides.
