June is one of the best months in the UK gardening year. The soil is warm, frost risk has passed across most of the country, and there is still plenty of time for both direct sowings and transplanting tender crops that have been growing on indoors. Whether you are planting out for summer harvests or sowing for autumn, June gives you more options than almost any other month.
This guide covers what to plant in June in the UK, what to sow directly outside, and what is still worth starting this month for a worthwhile harvest later in the season.
Why June Is Such a Good Month for Planting
By June, soil temperatures across the UK have risen enough to support the widest range of crops of the whole year. Seeds germinate reliably, transplants establish quickly, and the long days provide enough light for strong, steady growth.
Frost risk, which restricts so much of what can go outside in April and May, is largely behind us. This opens the door to all the tender crops that have been waiting indoors — tomatoes, courgettes, cucumbers, sweetcorn, pumpkins, basil and more can all go outside this month with confidence in most UK gardens.
June is also not too late for direct sowings of many fast-growing crops. Beans, salad leaves, beetroot, carrots and more can all be sown now and still produce well before the end of the season. For a full picture of what can be sown versus planted out this month, the UK vegetable planting calendar shows every crop at a glance.
Tender Crops to Plant Outside in June
June is the month when tender crops that have been started indoors can finally go into the ground. These are plants that cannot tolerate frost and need warm soil and settled weather to establish well. If you started any of these from seed in April or May and hardened them off properly, June is their time.
Before any of these go outside, make sure they have been hardened off — gradually introduced to outdoor conditions over one to two weeks. Plants moved directly from a warm indoor environment to outside without this step often suffer leaf scorch or growth stall. Read how to harden off plants in the UK if you have not done this yet.
Tomatoes
June is the main month for planting tomatoes outside in the UK. They need a warm, sheltered spot — a south-facing wall, a greenhouse, or a sheltered patio all work well. Outdoor tomatoes need consistent warmth and do not perform well in exposed or shaded positions. Read when to plant tomatoes in the UK for full timing guidance.
Courgettes
Courgettes grow quickly once outside in warm conditions and will start producing within weeks of being planted. Give each plant plenty of space — they spread wider than most beginners expect. See when to plant courgettes in the UK for timing detail.
Cucumbers
Outdoor cucumbers can go into a warm, sheltered spot in June. Greenhouse cucumbers may have gone in earlier but outdoor varieties need the extra warmth that June reliably provides. Full guidance is in when to plant cucumbers in the UK.
Sweetcorn
June is the best month for getting sweetcorn into the ground across most of the UK. Plant in a block rather than a row for good pollination and choose the warmest, most open position available. More detail in when to plant sweetcorn in the UK.
Pumpkins and Squash
Pumpkins and squash need space, warmth and a long growing season. June planting gives them enough time to develop and ripen before autumn frosts arrive. See when to plant pumpkins in the UK for full guidance.
French Beans and Runner Beans
Both French beans and runner beans can be planted out in June, either from indoor-started plants or as direct sowings into warm soil. June sowings establish quickly and crop reliably through summer. See when to plant French beans and when to plant runner beans in the UK for timing detail.
Basil
Basil can finally go outside in June once night temperatures are reliably above 10°C. A sheltered, south-facing spot or a container on a warm patio works best. Basil is extremely cold-sensitive so do not rush it outside before conditions are genuinely warm. Read when to plant basil in the UK for full guidance.
Vegetables to Sow Directly Outside in June
June is also one of the best months for direct sowing. The soil is warm enough for quick, reliable germination and there is still plenty of growing season ahead. Many crops sown now will produce well into autumn.
Salad Leaves and Lettuce
Salad leaves are one of the best crops to sow in June. They germinate quickly in warm soil, grow fast, and can be picked within weeks. Sow in short rows every two to three weeks for a continuous supply rather than one large harvest. See when to plant lettuce in the UK for sowing guidance.
Beetroot
Beetroot sown in June will be ready by late summer and into autumn. It is one of the most reliable direct-sow crops and does well in most UK garden soils. Full timing guidance is in when to plant beetroot in the UK.
Carrots
Carrots can still be sown in June for an autumn harvest. They need open, well-drained soil without too many stones. June sowings avoid some of the carrot fly pressure that earlier sowings can attract. See when to plant carrots in the UK for detail.
Spinach
Spinach sown in June can produce well into autumn as temperatures begin to drop — cooler conditions actually suit spinach better than midsummer heat. Avoid sowing during the hottest part of summer as it is prone to bolting in heat. Read when to plant spinach in the UK and why spinach bolts quickly in the UK before sowing.
Peas
Early June is the last sensible window for sowing peas in most UK gardens. Later sowings may not have enough time to produce a worthwhile harvest before the season ends. See when to plant peas in the UK for timing guidance.
Leeks
Leeks sown in June will be ready for harvesting from autumn through winter. They are one of the best crops for extending the growing season into the colder months. Full guidance in when to plant leeks in the UK.
Kale
Kale sown in June will provide harvests through autumn and well into winter. It is one of the hardiest and most productive crops for the second half of the year in UK gardens. See growing kale in UK gardens for more.
Courgettes and French Beans
If you missed the May sowing window, courgettes and French beans can still be sown directly outside in June. The warm soil means seeds germinate quickly and plants catch up fast. Both will crop well through summer into early autumn from a June sowing.
What It Is Too Late to Plant in June
June is generous but not unlimited. Some crops need more time in the ground than the remaining season can provide.
Maincrop potatoes are generally too late to plant in June in most UK gardens — they need a longer growing season and will not have enough time to bulk up before the autumn. Earlier varieties planted in June can still work but results will be modest. See when to plant potatoes in the UK for full guidance.
Parsnips are also very late by June. They are a long-season crop that ideally goes in from February to April. A June sowing may produce small roots but is unlikely to give a full harvest. Read how to grow parsnips in the UK if you want to plan ahead for next year.
Brussels sprouts and other brassicas for winter harvests should have gone in earlier — late May or early June is the absolute limit for these crops. If you missed the window, when to plant brassicas in the UK covers the full timing for next season.
For the full picture of what is and is not worth planting at any time of year, what happens if you plant vegetables too early and when to plant vegetables in the UK are both useful references.
Other Jobs Worth Doing in June
June is not just about planting. Once crops are in, keeping on top of a few regular jobs makes a big difference to how well they perform through summer.
Watering becomes more important as temperatures rise and soil dries more quickly. The most common watering mistake is doing it too often and too shallowly — this encourages surface roots rather than the deeper rooting that makes plants more resilient. How often to water plants in the UK explains the right approach for summer conditions.
Slugs are at their most damaging in June, particularly after rain. Young transplants and fresh sowings are most vulnerable in the first weeks after going outside. How to get rid of slugs in the garden covers the most effective UK-safe methods.
Thinning seedlings from direct sowings is also an important June job. Overcrowded seedlings compete for light, water and nutrients and rarely develop as well as those given proper spacing. When to thin vegetable seedlings in the UK explains when and how to do it properly.
For a full list of everything worth doing in the garden this month, what to do in the garden each month covers the complete June picture.
Getting the Soil Right Before Planting
June planting goes much better when the soil is in good condition. Beds that have been improved with compost or organic matter over the previous weeks will establish transplants faster and support stronger growth through summer.
If your soil is heavy, compacted or prone to waterlogging, that will limit how well June plantings perform regardless of timing. How to improve garden soil in the UK and how to improve garden drainage in UK soil cover the most practical steps for getting beds ready.
Frequently Asked Questions
What can I plant outside in June in the UK?
June is one of the best months for planting outside in the UK. Tender crops including tomatoes, courgettes, cucumbers, sweetcorn, pumpkins, French beans, runner beans and basil can all go outside once frost risk has passed and they have been hardened off. Direct sowings of salad leaves, beetroot, carrots, spinach, peas, leeks and kale are also well timed in June.
Is it too late to plant vegetables in June in the UK?
No — June is still an excellent month for both planting out and direct sowing. Many crops planted or sown in June will produce well before the end of the season. Some long-season crops like maincrop potatoes and parsnips are getting late, but the majority of summer and autumn vegetables are well within their window in June.
What vegetables can I sow directly outside in June?
Salad leaves, lettuce, beetroot, carrots, spinach, peas, leeks, kale, courgettes and French beans can all be sown directly outside in June. The warm soil ensures quick germination and most will produce a worthwhile harvest before the end of the season.
Can I plant tomatoes outside in June in the UK?
Yes — June is the main month for planting tomatoes outside across most of the UK. Choose a warm, sheltered spot and make sure plants have been hardened off before going outside.
What should I be doing in the garden in June?
As well as planting and sowing, June is a good month for watering regularly as temperatures rise, dealing with slugs on young transplants, thinning seedlings from direct sowings, and keeping on top of weeds before they compete with crops.
Can I still sow courgettes in June?
Yes — courgettes can be sown directly outside in June and will establish and crop quickly in warm conditions. A June sowing will produce well through summer into early autumn.
A Sensible Place to Start
If you only do one thing in the garden this June, get your tender crops outside. Tomatoes, courgettes, cucumbers, sweetcorn and beans have been waiting for conditions warm enough to support them — June is that moment across most of the UK.
Add a few direct sowings of fast-growing crops like salad leaves, beetroot and carrots and you will have harvests coming in from late summer right through to autumn. June is not the end of the planting season — for many crops it is the best time of the whole year.
If you are planning ahead and want to know what comes next, May gardening jobs in the UK covers what should already be done, and easy vegetables to grow in the UK is a good starting point if you are still deciding what to grow this season.