The good news is that the right timing is genuinely simple once you know it. Most UK gardeners can grow good sweetcorn with a bit of planning and a sheltered spot.

This guide covers exactly when to plant sweetcorn in the UK, when to sow indoors, when to plant outside, and when to harvest. For the full growing process from seed to harvest, see How to Grow Sweetcorn in the UK. For the bigger picture across the whole growing year, When to Plant Vegetables in the UK covers timing for every common UK crop. And for everything else worth getting in the ground this month, What to Plant in May in the UK has the full list.

When to Sow Sweetcorn Seeds Indoors in the UK

Most UK gardeners start sweetcorn indoors. It is much more reliable than direct sowing because you can control the temperature properly, which is exactly what sweetcorn seeds need to germinate.

The best time to sow sweetcorn seeds indoors is from mid-April to early May. This gives you about four to six weeks of indoor growing before the seedlings are ready to plant out, which is exactly when outdoor conditions are warm enough.

Sweetcorn seeds need a soil temperature of at least 16°C to germinate properly. On a windowsill or in a propagator this is easy to achieve. In cold compost outdoors in April it almost never happens, which is why direct sowing fails so often early in the season.

Sow individual seeds in deep pots or modules about 2 to 3cm deep. Sweetcorn does not like having its roots disturbed so giving each seed its own pot from the start saves you trouble later. Keep them somewhere warm and bright until they are ready to harden off.

For more on why soil temperature matters so much in spring, When Is Soil Warm Enough to Plant Vegetables is worth a read.

When to Plant Sweetcorn Outside in the UK

Sweetcorn goes outside from late May to early June in most parts of the UK. The soil needs to be warm and overnight temperatures should be reliably above 10°C. In southern England this can be from late May. In the Midlands and northern England it is usually early June. In Scotland and exposed upland areas, mid-June is more sensible.

Before they go out for good, sweetcorn plants need hardening off like any tender crop. A week or two of gradual outdoor exposure during the day makes a big difference to how quickly they settle in once planted out. How to Harden Off Plants in the UK covers the full process if you have not done it before.

One thing that is genuinely unique about sweetcorn is how it needs to be planted. Sweetcorn is wind-pollinated, which means the pollen needs to drift from one plant to another to produce filled cobs. Planting in a single long row almost guarantees a poor crop because the wind blows pollen away rather than between plants. Always plant sweetcorn in a block or grid pattern with at least 3 rows side by side. Even a small block of 9 plants in a 3 by 3 grid works much better than a row of 12.

Space plants about 45cm apart in each direction. Water them in well and give them a sheltered, sunny spot.

If you are not sure when frost is finally past in your area, UK Last Frost Dates by Postcode is worth checking.

Can You Grow Sweetcorn in Pots in the UK?

Yes, but with a couple of important rules. Sweetcorn can grow well in pots if the pots are big enough and you grow several together rather than just one or two.

The pollination problem above applies in pots too. A single sweetcorn plant in a pot on its own will not pollinate properly and the cobs will be poor. If you want to grow sweetcorn in containers, get at least 4 to 6 large pots and group them close together so the wind can move pollen between plants.

The pots themselves need to be at least 30cm wide and the same deep, ideally bigger. Sweetcorn has surprisingly hungry roots and small pots simply do not give them enough room. Use a good quality multipurpose compost and water consistently. Can You Grow Vegetables in Pots in the UK? covers what works well in containers.

How Long Does Sweetcorn Take to Grow?

From sowing to harvest, sweetcorn takes around 3 to 4 months in the UK, depending on the variety and the weather. Seeds sown indoors in mid-April will usually be ready to harvest from late August through September.

The plant itself grows surprisingly fast once it gets going. By July it is often head height. By August the cobs are forming and you start watching for the right moment to pick them.

When to Harvest Sweetcorn in the UK

Harvest time is usually late August to early October depending on where you are and when you planted. The trick is knowing when each cob is properly ready, because once it is ripe it does not stay at peak quality for long.

There are three classic signs that sweetcorn is ready to harvest:

The tassels at the top of each cob turn brown and dry. The cob feels full and firm when you squeeze it. And if you peel back a small section of the husk and squeeze a kernel with your fingernail, the liquid that comes out should be milky white. Clear liquid means the cob is not ready yet. Thick paste means you have left it too long.

Pick cobs by twisting them firmly downwards rather than pulling. They come away cleanly when ripe. Eat them as soon as possible after picking. Sweetcorn loses its sweetness within hours of being harvested as the sugars start converting to starch. The difference between a cob eaten 20 minutes after picking and one eaten the next day is genuinely dramatic.

Common Sweetcorn Growing Problems

Patchy or empty cobs. Almost always a pollination problem. Either the plants were grown in a single row instead of a block, or there were not enough plants for proper pollination. Plant in a grid of at least 3 by 3 next year.

Seedlings rotting in the soil. The compost was too cold or too wet at sowing time. Wait for warmer conditions or sow indoors first.

Plants growing slowly. Usually cold soil or unhardened plants planted out too early. Sweetcorn needs warmth and once it is checked early in the season it can take weeks to recover. Cold Soil Problems in UK Gardens covers exactly why this happens and how long it takes plants to recover.

Plants flopping over. Wind damage. Sweetcorn gets tall and a sheltered spot is important. If you garden somewhere exposed, planting in a block helps as the plants support each other to some extent. For more general protection advice, How to Protect Vegetables from Frost in the UK covers fleece and cloches that also help with wind.

Animals eating the cobs. Squirrels, badgers, and birds will all happily strip a sweetcorn patch just before you were planning to harvest. If this is a problem in your area, netting or fleece bags around individual cobs work well in the last few weeks before harvest.

FAQs

A Sensible Place to Start

Sweetcorn is one of the most rewarding crops you can grow in a UK garden, and it is genuinely worth the small amount of planning it takes. Sow indoors in mid-April, plant out in late May or early June in a block rather than a row, and harvest from late August onwards.

If you have not grown it before, start with around 9 plants in a 3 by 3 block in the sunniest spot you have. The pollination works properly, the cobs come out full, and the whole experience tends to convince people to grow it again the following year.

For everything else worth planting in May, What to Sow in May in the UK and May Gardening Jobs in the UK cover the full picture. And for general advice on growing veg from start to finish, Growing Vegetables Successfully in the UK is the practical year-round guide.

The good news is that this is one of the easiest gardening problems to fix. The answer is hardening off, and it takes about two weeks of very little effort. Once you know how to do it properly, the results are dramatic. Your plants will settle into outdoor life within days rather than weeks.

This guide explains what hardening off is, how to do it properly in the UK, and what happens if you skip it. If you want the bigger picture of what to plant in May, What to Plant in May in the UK covers the full crop list.

What Is Hardening Off?

Hardening off is the process of getting indoor plants used to being outside before you plant them out for good. It really is that simple.

Plants grown indoors have only ever known warm, still air, gentle light, and steady temperatures. Outside the world is very different. Sunlight is much stronger. Wind is constant. Temperatures change a lot between day and night. If you take a plant from one environment and dump it into the other, it goes into shock.

The way to avoid this is to introduce them gradually. Spend a week or two letting them experience outdoor conditions for a few hours a day, then a bit longer, then overnight, then permanently. By the end they are ready to thrive outdoors instead of struggling.

Why Hardening Off Matters in the UK

It matters more in the UK than in most other places because our weather is so changeable. A warm sunny morning can become a cold windy afternoon within hours. A mild week can be followed by a sudden cold snap. Plants that have not been hardened off cannot cope with this.

You can spot a plant that has been put out too soon almost straight away. The leaves often look bleached or pale, growth stops, and the plant just sits there for weeks. Tomatoes are particularly vulnerable. So are courgettes, cucumbers, French beans and most flowering bedding plants.

The other reason it matters in the UK is timing. Most tender plants need to go outside in May, which is exactly when the weather is at its most unreliable. If you want to know when frost is finally past in your area, UK Last Frost Dates by Postcode is worth checking.

Which Plants Need Hardening Off?

Any plant that has been grown indoors or in a greenhouse needs hardening off before going outside. The most common ones in UK gardens are:

Tomatoes, courgettes, cucumbers, squash, pumpkins, French beans, runner beans, sweetcorn, and peppers and chillies all need it. So do tender bedding plants like cosmos, marigolds, petunias, busy lizzies and dahlias.

Plants you do not need to harden off include hardy seeds you have sown directly outside in the ground, plants bought already growing outside at a garden centre, and tough plants like brassicas which are usually fine to plant out without much fuss.

If you are not sure which crops are tough and which are tender, Vegetables That Survive Late Frost is a useful guide.

How to Harden Off Plants Step by Step

This is the bit most people overcomplicate. It is genuinely simple. Here is exactly what to do.

Day 1 to 3: A Couple of Hours Outside

Put your plants outside in a sheltered spot for two or three hours during the warmest part of the day. Somewhere out of direct wind is ideal, especially on the first day. A patio against a south-facing wall works well. Take them back inside before the temperature starts to drop in the afternoon.

Day 4 to 6: Half a Day Outside

Now give them four or five hours outside. They can be in slightly more direct sun by now and they will start to look stronger and stockier. Keep bringing them in at night.

Day 7 to 9: A Full Day Outside

Leave them out for the whole day. They should be coping well at this stage, and direct sun and wind exposure are now part of normal life. Bring them inside in the evening before night temperatures drop.

Day 10 to 14: Overnight

If overnight temperatures are above 10°C and no frost is forecast, leave them outside overnight. Start with a sheltered spot, ideally with some kind of cover or against a wall. After two or three nights they should be tough enough to plant out properly.

Day 14 Onwards: Plant Out

By now your plants are properly hardened off. They will go into the ground and keep growing rather than stalling for weeks. Water them in well after planting and they will be away.

How to Harden Off Tomato Plants

Tomatoes are the plant most people ask about when it comes to hardening off, so they deserve their own section.

Tomato plants grown on a windowsill from March or April are some of the most coddled plants in any UK garden. They have never felt wind. They have never had bright direct sunlight on their leaves. The leaves can actually scorch if they go into full sun without being eased into it. This is why so many people put their tomatoes outside in May and watch the top leaves go white or crispy within a couple of days.

The fix is the same gradual process described above, but with one extra rule. Watch out for sun scorch in the first few days. If the leaves look bleached or have white patches, move them into shade for the next session and try again the day after with a few minutes less direct sun.

Most UK tomato growers start hardening off in the last week of April or first week of May, with the aim of planting out from mid to late May. When to Plant Tomatoes in the UK covers the full timing.

How to Harden Off Courgettes and Other Tender Crops

Courgettes, cucumbers, squash and pumpkins all hate cold and wind even more than tomatoes do. They need a slightly slower hardening off process and absolutely should not go outside until overnight temperatures are reliably above 10°C.

Start them off later than tomatoes. Mid May is a good time to begin hardening them off in most parts of the UK, with planting out from the end of May or early June. Even one cold night can set them back badly. If your courgette seedlings have been struggling already, Why Courgette Seeds or Seedlings Fail in the UK is worth a read.

What If You Forget to Bring Plants In?

It happens. You put plants out for the day, get distracted, and remember at midnight when it is 4°C outside. What now?

Honestly, just leave them. Going out at midnight to bring them in does not help much because the damage if any is already done. Check them in the morning. If the leaves look fine, you got lucky and you can carry on as if nothing happened. If they look bleached, drooping or damaged, bring them in to recover and start the hardening off process again from a few days earlier.

Tomatoes and courgettes can usually bounce back from one cold night. Damaged growing tips are slower to recover than damaged lower leaves, so check those particularly.

Common Hardening Off Mistakes

The mistakes are nearly always the same.

Skipping it altogether. The most common mistake by far. Plants moved straight from indoors to outdoors almost always struggle, even in mild weather. The two weeks really do make a difference.

Rushing through it. Doing the whole process in three or four days is not enough. Plants need time to physically toughen up. Two weeks is the minimum and even that is sometimes not enough for very pampered plants.

Putting them out in full sun on day one. Strong direct sunlight is one of the harshest things plants experience after being indoors. Always start in shade or filtered light and work up.

Leaving them out overnight too early. A clear, still night in early May can drop to 2 or 3°C even when the days have been warm. Overnight temperatures matter more than daytime ones for tender plants. If you are caught out by an unexpected frost, How to Protect Vegetables from Frost in the UK covers what to do quickly.

Forgetting about wind. Wind dries plants out and physically stresses stems. A sheltered spot for the first few days makes a real difference. Direct exposure to a stiff breeze on day one is too much for plants that have only ever known still indoor air.

FAQs

A Sensible Place to Start

Hardening off is one of those gardening jobs that sounds fiddly but really is not. A few hours outside in a sheltered spot, building up gradually over two weeks, and that is it. The plants do all the actual work themselves.

If you only ever do one new thing in your garden this May, make it this. The difference between hardened off plants and plants that went straight outside is huge. Once you have done it once and seen the results, you will never skip it again.

For everything else worth doing in the garden this month, May Gardening Jobs in the UK covers the full list.

If you haven’t planned out your garden yet, our free UK Vegetable Garden Planner is a quick way to work out exactly what to plant and where based on your space and location.

This is a practical rundown of the gardening jobs for May in the UK not an overwhelming masterclass, just the things that genuinely make a difference this month. Work through them at your own pace and the rest of the season tends to look after itself.

Get Your Tender Plants Outside

If you’ve been nursing tomatoes, courgettes, cucumbers, or squash on a windowsill since March, May is when they finally get to go outside. The key is not to rush it. Early May still carries a frost risk in many parts of the UK, and plants that go from a warm house straight into an exposed bed often just sit there sulking for weeks.

The process you want is hardening off taking plants outside during the day and bringing them back in at night over a week or two before leaving them out permanently. It sounds fiddly but it makes a real difference. Plants that are properly hardened off establish quickly. Plants that skip that step often don’t.

From late May, once overnight temperatures are reliably above 10°C, most tender crops can go out and stay out. If you’re not sure what can go out when, What to Plant in May in the UK has the full breakdown.

Sow Directly Outside

May is one of the best months of the year for sowing directly into the ground. The soil is warm, days are long, and seeds that struggled to germinate in the cold of March will shoot up quickly now.

The crops worth getting in now are carrots, beetroot, peas (early May only the window starts to close as it warms up), French beans, runner beans, salad leaves, spinach, and spring onions. If you’re doing maincrop potatoes in the north, early May is still within the planting window too.

It’s also a great month to get flowers in the ground. Hardy annuals like nasturtiums, cornflowers, and calendula can go straight into prepared soil right now. What Flowers to Plant in May in the UK covers what to sow, what to plant out, and which flowers work best alongside vegetables.

For the full sowing guide with depths, spacing, and succession sowing advice, What to Sow in May in the UK covers everything in detail, and what to sow in July in the UK covers the later summer sowings for autumn and winter crops.

One thing worth doing with carrots and salad leaves is sowing a short row every two to three weeks rather than one big sowing all at once. It staggers the harvest and means you’re not pulling everything at the same time and wondering what to do with it all. When to Plant Carrots in the UK covers the succession sowing timing clearly.

Start Leeks and Brassicas Indoors

Not everything is about getting things outside. May is the right time to start leeks indoors or in a seedbed for planting out later in summer they’re a slow crop and if you leave it too late the timeline doesn’t work. Same goes for brassicas like kale, purple sprouting broccoli, and Brussels sprouts, which all benefit from being started now under cover and planted out in June.

These crops will be in the ground for months, so it’s worth getting the timing right from the start. When to Plant Leeks in the UK and When to Plant Brassicas in the UK cover the sowing and planting schedules in full.

Thin Your Seedlings

If you sowed carrots, beetroot, lettuce, or other direct-sown crops in April, they’re probably coming up nicely now. And they’re probably too crowded. Thinning feels brutal you’re pulling out perfectly healthy seedlings but leaving them too close together almost always means worse results for everyone. They compete for water, light, and nutrients, and none of them win.

The general rule is to thin to the spacing recommended on the packet. Do it in stages if it helps thin once when they’re small, then again a week or two later when you can see clearly which ones are strongest. When to Thin Vegetable Seedlings in the UK explains how to do it without second-guessing yourself.

Start Feeding Hungry Plants

Once plants are in active growth which by May most of them are feeding starts to matter. Tomatoes, courgettes, cucumbers, and other hungry crops benefit from a regular liquid feed once they’re established and growing. Don’t bother feeding seedlings that have just gone in the ground; give them a week or two to settle first.

The thing most people get wrong with feeding is doing too much too soon, which pushes lots of leafy growth at the expense of fruit and roots. A balanced feed at the right stage works far better than lots of feed at the wrong one. getting feeding right is worth a read before you start reaching for the bottle every week.

Deal With Slugs Before They Get Out of Hand

Slugs are at their worst in May. Mild evenings, damp soil, and rows of tender young seedlings it’s basically a slug paradise. If you’ve ever wondered why your seedlings disappeared overnight between sowing them and expecting to see them come up, this is almost certainly why.

The good news is that a bit of action early in the season is worth far more than trying to deal with the problem once it’s out of hand. Check plants after dark if you want to see what you’re dealing with. Copper tape, wool pellets, and nematodes all work without harming anything else in the garden. How to Get Rid of Slugs in the Garden covers the methods that actually make a difference.

Keep an Eye on Frost

May is a brilliant month, but it has a sting in its tail. A cold, clear night in the first two weeks of the month can still bring a ground frost, and tender plants that went outside too early are the ones that suffer. A layer of fleece over vulnerable plants is all you need it doesn’t look glamorous but it works.

If you’re not sure when your last frost date typically falls in your area, UK Last Frost Dates by Postcode is genuinely useful. And if frost is forecast when you’ve already planted out, How to Protect Vegetables from Frost in the UK covers what to do quickly.

Sort Out Your Soil Before It’s Too Late

If there are still beds that haven’t had anything done to them, May is your last real chance to improve them before the growing season is properly underway. Adding compost and working it into the top layer of soil makes a real difference to how well crops establish especially in heavy clay or light sandy ground.

You don’t need to dig everything over. In fact, minimal digging is often better. The goal is just to give the top layer some structure and organic matter before plants go in. How to Improve Garden Soil in the UK is the practical guide for this, and Best Compost for Vegetables in the UK covers what’s actually worth buying.

Water Consistently But Not Obsessively

May can be surprisingly dry in the UK, and newly sown seeds and recently planted crops both need consistent moisture to establish properly. The most common watering mistake is doing it little and often a quick splash every day that only wets the surface rather than a thorough soak less frequently that actually reaches the roots.

Water in the morning if you can, keep it off the leaves where possible, and let the soil dry out slightly between waterings rather than keeping it permanently soggy. Overwatering causes just as many problems as underwatering. How Often to Water Plants in the UK has the detail on getting this right.

FAQs

A Sensible Place to Start

May can feel overwhelming because there’s so much going on. But most of it doesn’t need to happen on day one. Work through the list steadily get tender crops hardened off and outside, keep up with sowing, deal with slugs early, and make sure things are getting enough water. That covers the essentials.

The rest feeding, soil improvement, thinning can follow as you go. Gardening in May is supposed to be enjoyable, not a race. The garden doesn’t need everything done at once. It just needs you to show up regularly and pay attention. The same monthly approach continues in June gardening jobs and August gardening jobs in the UK.

If you’re looking for a broader picture of what the whole growing season looks like, What to Do in the Garden Each Month covers the full year in the same practical style. And if you have plants ready to go outside this month, How to Harden Off Plants in the UK is one of the most important reads of May.

There’s a lot you can plant in May — both sowing seeds directly outside and getting tender crops that have been growing indoors moved out into the garden. The catch is that May has two halves. Early May still carries a frost risk in many parts of the UK, particularly in the north, on higher ground, and in known frost pockets. Late May is a different story, and the window opens up considerably once that risk has passed.

This guide covers the vegetables, seeds, and flowers worth planting in May in the UK, along with what’s still better kept indoors for now. For the full year overview, When to Plant Vegetables in the UK and for everything else worth doing in the garden in May beyond planting May Gardening Jobs in the UK. If sweetcorn is on your list this season, When to Plant Sweetcorn in the UK covers exactly when to sow and when it can safely go outside, and How to Grow Sweetcorn in the UK covers the full growing process.

Vegetables to Sow Directly Outside in May

May is one of the best months of the year for direct sowing — putting seeds straight into prepared beds outdoors. The soil is warm enough for reliable germination, and anything you sow now has months of growing weather ahead of it.

Carrots are one of the best veg to sow in May. Germination is far more consistent now than in the cold, wet soil of early spring, and you’re much less likely to get patchy rows. A lot of gardeners sow a short row every couple of weeks through May and into June rather than doing it all at once — it spreads the harvest and avoids a glut. When to Plant Carrots in the UK has the full regional timing.

Beetroot is one of the most dependable May sowings there is. It germinates quickly in warm soil, grows without much fuss, and is genuinely forgiving if you’re still finding your feet. When to Plant Beetroot in the UK covers the detail if you want it.

Peas can still go in during early May, though the window starts to close as the season warms up. If you haven’t sown any yet, get them in now. When to Plant Peas in the UK explains what to expect from later sowings.

French beans and runner beans can be sown outdoors from mid-May, once the soil has warmed properly and overnight temperatures have settled. Any earlier and the seeds tend to just sit there — or rot. It’s one of those crops where a bit of patience in May pays off in June. When to Plant French Beans in the UK and When to Plant Runner Beans in the UK are both worth a quick read before you sow.

Lettuce, salad leaves, spinach, and spring onions are among the easiest things you can sow in May. They’re fast, low-maintenance, and you can be harvesting within a few weeks. If you’re new to growing, these are great confidence-builders.

Potatoes can still go in during early May, particularly maincrop varieties in cooler northern areas where planting earlier wasn’t possible. If you’re in the south, first earlies may already be in the ground — but it’s not too late. When to Plant Potatoes in the UK covers the full timeline by variety and region.

Tender Crops to Plant Out in May

If you’ve been growing tomatoes, courgettes, cucumbers, or squash indoors since March or April, May is when they start moving outside. But not all at once, and not before they’re ready.

The step that makes the biggest difference is hardening off — gradually getting plants used to outdoor conditions over a week or two before leaving them out permanently. Move them outside during the day and bring them back in at night to start with. Plants that skip this step often sit there doing nothing for weeks, even when the weather looks fine. It’s worth doing properly.

Tomatoes are usually ready to go outside from late May, once overnight temperatures are consistently above 10°C. In a greenhouse or polytunnel, you can do it earlier. Rushing tomatoes out in early May is one of the most common mistakes of the month — they look okay for a few days and then stop. When to Plant Tomatoes in the UK covers the timing in full.

Courgettes can go outside from mid to late May in milder, sheltered gardens — but late May or early June is more sensible in the north or in exposed spots. One cold night can set them back badly. How to Grow Courgettes in the UK covers everything from sowing to harvest.

Cucumbers go outside from late May, but only in genuinely warm and sheltered spots. They’re more sensitive to cold than courgettes and often do better kept under cover in the UK. When to Plant Cucumbers in the UK will help you decide whether outdoor or indoor growing suits your space better.

Growing in containers rather than open ground? The same rules apply — tender crops need warm nights before they go outside, whatever size pot they’re in. Can You Grow Vegetables in Pots in the UK? covers what works well in containers through the season.

Flowers to Plant in May in the UK

May is also a good month to get flowers in the ground, whether you’re growing them alongside vegetables, in borders, or in pots. For the full breakdown of what flowers to sow and plant out this month, What Flowers to Plant in May in the UK covers every option in detail. Hardy annuals like nasturtiums, cornflowers, and calendula can all be sown directly outside now and will flower through summer. They’re easy from seed and nasturtiums in particular are almost impossible to fail with.

If you want to plant out bedding that was started indoors — such as cosmos, marigolds, or antirrhinums — wait until the risk of frost has passed in your area before putting them outside permanently. The same hardening-off process that applies to tomatoes and courgettes applies here too.

Nasturtiums are worth a special mention if you’re growing vegetables too — they’re useful companion plants that attract aphids away from other crops and bring in beneficial insects.

Still Worth Starting Indoors in May

Not everything needs to go outside this month. Leeks are ideally started indoors or in a seedbed in May for planting out later in summer. They’re a long-season crop and starting them now keeps the whole timeline on track for an autumn and winter harvest. When to Plant Leeks in the UK covers the full schedule.

Brassicas for autumn and winter — kale, purple sprouting broccoli, and Brussels sprouts — can also be started under cover in May for planting out in June. They’ll be in the ground for months, so it’s worth reading When to Plant Brassicas in the UK to get the spacing and timing right from the start.

Watch for Frost and Slugs

Frost catches people out in May every year. A clear, still night in the first two weeks of the month can drop temperatures enough to damage tender plants that went out too soon. If you’re not sure when your last frost typically falls, UK Last Frost Dates by Postcode is worth checking. And if frost is forecast after you’ve already planted out, How to Protect Vegetables from Frost in the UK covers what you can do quickly.

Slugs are the other May problem. Mild, damp evenings after spring rain are perfect conditions for them, and young seedlings are most vulnerable in the first few weeks. If they’re a persistent issue in your garden, How to Get Rid of Slugs in the Garden covers the methods that actually work.

Once seedlings are up, don’t skip thinning them. Crowded seedlings compete badly for light, water, and nutrients and rarely produce good crops. When to Thin Vegetable Seedlings in the UK explains how to do it without pulling out the ones you want to keep.

FAQs

A Sensible Place to Start

May has more planting options than almost any other month in the UK. Hardy veg like carrots, beetroot, and salad leaves can go straight in the ground now. Tender crops like tomatoes and courgettes follow from mid to late May once conditions are right. And if you want flowers too, hardy annuals like nasturtiums can go in right alongside your vegetables.

The trap most people fall into is rushing. Getting things outside too early, sowing into soil that hasn’t warmed properly, or skipping the hardening-off step all slow things down rather than speed them up. A slightly later start in the right conditions nearly always beats an earlier one that struggles.

If you’re not sure where to begin, pick two or three things rather than trying to do everything at once. Beetroot, lettuce, and French beans are all solid May sowings — fast results, low risk, and a good foundation for the rest of the season.For a more detailed guide to sowing seeds specifically, What to Sow in May in the UK covers every crop with sowing depths, spacing, and timing. And if you have tender plants ready to go outside, How to Harden Off Plants in the UK explains the two-week process that stops them stalling when they go out.