June is a surprisingly good month for sowing vegetables, particularly for crops that enjoy warmer soil and longer daylight hours. While early spring often gets most of the attention, many heat-loving plants actually establish faster and more reliably once the weather and the soil has warmed. In the UK and other temperate climates, June sowings can still provide generous harvests later in summer and well into autumn.
This is also one of the easiest times for newer gardeners to sow seeds directly into the soil outdoors. Germination is usually quicker, seedlings grow away faster, and there’s less need for heated propagators, grow lights, or balancing trays on windowsills. So if your growing season got off to a slow start, don’t worry, there’s still plenty of time to fill beds, containers, and tubs with healthy, productive vegetables.
Before we dive in, a word of warning for those with a greenhouse or polytunnel. Last week in the UK it was very hot with many undercover growing areas reaching 40 °C (104 °F) plus. These daytime temps can be quite distressing for seeds, making germination problematic. Seeds generally don’t do well in sizzling soil temperatures. If this is the case for you, It’s worth considering an alternative spot for seed sowing during very hot periods.
So let’s get into 5 veg seeds you might like to sow in June, some of which will also grow perfectly well in large pots or containers.
PUMPKINS
Pumpkins can still be started in early June, particularly in milder parts of the UK and other temperate climates. While giant pumpkins may need a longer season, many smaller and medium-sized varieties grow perfectly well from early June sowings.
Pumpkins are part of the wide-ranging Cucurbitaceae family. More specifically, they are classified under the genus Cucurbita. Squashes, courgettes/zucchini and butternut squash are also part of this genus. This whole family of plants likes heat and tend to spread out. They require lots of space unless you train them to grow vertically.
Growing Conditions
- Sow in rich, fertile soil with plenty of organic matter
- Ideal temperature: 18–30°C (65–86°F)
- Sow seeds 1 inch deep (2.5 cm)
- Plant in a sunny, sheltered position
Containers?
It is possible to grow pumpkins in pots – but choose a large container at least 18–24 inches wide (45–60 cm) and keep plants well fed and watered. Pots tend to dry out more quickly, so regular ‘deep watering’ is important. For more on ‘deep watering’, see her Unlock Healthy Growth with Deep Watering Techniques
Pumpkins are also hungry plants, so adding compost or well-rotted manure before planting will make a noticeable difference to growth and fruit production. In fact, if you have a compost pile that’s not quite ready, it might be the ideal environment to grow pumpkins.
TURNIPS
Turnips, bizarrely, are part of the Mustard family (Brassicaceae). I think they are one of the most versatile and underrated vegetables in the garden. A June sowing of turnips can yield a crop of lovely, tender roots for late summer and early autumn.
They don’t take up much space, and the leaves can be used in a similar way to spinach. So really, you get two crops for the price of one – what’s not to like?
I know lots of folk, especially in the UK, who view the humble turnip as nothing more than ‘animal feed’. But trust me, a young, sweet roasted turnip with Sunday dinner or in a pan roast with other root veg is an absolute delight.
Growing Conditions
- Prefers cooler growing conditions
- Ideal temperature: 10–18°C (50–65°F)
- Sow seeds ½ inch deep (1 cm)
- Thin seedlings carefully for decent-sized roots
As ever, I try not to thin seeds – I can’t bear ditching them. I try and sow each individual seeds at the allotted packet spacing. However, that’s just my personal preference – you do what works best for you.
Germination & Harvest
- Germinates in around 7–10 days
- Ready in roughly 6–10 weeks
Containers?
Turnips can be planted in containers or tubs, but make sure the container is fairly deep. These tasty little all-rounders can have taproots up to 30 inches (76 cm) long, so they need plenty of depth.
SPRING ONIONS (SCALLIONS)
Spring onions are fast, satisfying, and ideal for squeezing into spare gaps around the garden. They are extremely versatile in the kitchen, and you can use both the white bulb and the green stalk
Spring Onions belong to the Amaryllidaceae family – specifically Allium Cepa. This broad family and includes garlic, shallots and chives.
These are brilliant for small-space gardeners because they take up very little room.
Growing Conditions
- Sow directly outdoors
- Ideal temperature: 10–25°C (50–77°F)
- Sow thinly at around ½ inch deep (1 cm)
- Keep watered during dry weather
Germination & Harvest
- Germinates in 7–14 days
- Harvest in roughly 8–10 weeks
Very suitable for containers and troughs.
Containers?
Spring onions are perfect for containers; just make sure the soil in your pots doesn’t dry out. Keep the soil moist (not soaking), and they will be just fine in containers with reasonable spacing.
KALE (INCLUDING BLACK KALE/CAVOLO NERO)
Kale is one of the most rewarding crops you can sow in June, particularly because it can continue producing well into autumn and even through winter in milder areas. Black kale, often sold as Cavolo Nero, is especially popular for its dark, crinkled leaves and excellent flavour once the weather cools slightly.
Kale is another plant belonging to the Brassicaceae family.
June is an excellent time to sow kale directly outdoors as it often produces sturdier plants with less fuss than earlier indoor sowings. A June sowing can also help avoid some of the early spring pests.
When harvesting, pick the outside lower leaves first; it will encourage the plant to keep producing for months.
Growing Conditions
- Sow directly into prepared soil or raised beds
- Ideal temperature: 10–24°C (50–75°F)
- Sow seeds around ½ inch deep (1–1.5 cm)
- Thin seedlings to around 18 inches apart (45 cm) once established
- Prefers fertile soil with good moisture retention
Germination & Harvest
- Germinates in roughly 5–10 days
- Baby leaves can be harvested in around 30 days
- Mature leaves are usually ready in 8–12 weeks
Containers?
Yes, kale grows surprisingly well in large tubs or deep containers, particularly the compact varieties. Choose containers at least 12 inches deep (30 cm) and keep plants well watered during dry spells.
SWEDE (RUTABAGA)
Swede is one of those vegetables that quietly rewards patient gardeners. Sow direct in June, and it will have plenty of time to develop, ready for harvest through the winter months. Swede benefits from maturing slowly and is well-suited to the UK and generally more temporated growing conditions.
Swede, along with Turnips (see above) are a part of the Brassicaceae family, commonly known as cruciferous vegetables. They include broccoli, sprouts, kale and cauliflower, etc.
Young swede seedlings can attract flea beetles and cabbage root fly, so covering newly sown rows with fine mesh or fleece can help plants establish more successfully. Cooler autumn weather also tends to improve the flavour, making roots sweeter and less woody.
Growing Conditions:
- Best sown directly outdoors where it is to grow
- Ideal temperature: 8–20°C (46–68°F)
- Sow seeds around ½ inch deep (1–1.5 cm)
- Space rows around 18 inches apart (45 cm)
- Thin seedlings to roughly 8 inches apart (20 cm)
Swedes prefer fertile, moisture-retentive soil and grow best when watered consistently during dry periods.
Germination & Harvest:
- Germinates in around 7–14 days
- Harvest from roughly 12–16 weeks after sowing
- Can often remain in the ground well into winter in milder areas
Containers?
Possible, but not ideal unless using a very deep container. If growing in tubs, choose one at least 16 inches deep (40 cm) to allow good root development.
OTHER VEGETABLES YOU CAN STILL SOW IN JUNE
If you still have room, June is also a good time to sow:
- French beans
- Runner beans
- Carrots
- Courgettes (zucchini)
- Peas
- Radishes
- Pak choi
- Florence fennel
Many herbs can also be sown in June, such as basil, coriander (cilantro), dill, and parsley. If you haven’t started sowing herbs yet, there is still time – sow a few seeds every 1-2 weeks through June for a good continuous supply.
Final Thoughts
June gardening often feels calmer than the frenetic rush of early spring. So if you haven’t started yet, or if earlier sowings didn’t go to plan, there is still plenty of time to grow productive, delicious food this season.
Start with a few things you genuinely enjoy eating, keep watering simple and consistent during dry spells, and don’t overcomplicate it. A handful of well-cared-for plants will almost always bring more satisfaction than trays and trays of seedlings that become overwhelming.
Remember – if you’re feeling behind, don’t panic. Garden centres are full of healthy plug plants and young vegetable plants at this time of year, and many crops catch up remarkably quickly once planted into warm soil. Don’t let anyone tell you that if you don’t grow from seed, you are not a proper gardener. Gardening is about enjoyment, and what fits with your lifestyle. So you do you!
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For more content, see below:
- Top Vegetables to Sow in June for a Bountiful Harvest
- Simple Ways to Preserve Everyday Herbs (Without Fancy Equipment)
- Find Peace: Calm the Chaos and Remember, It’s Not Too Late
- Unlock Healthy Growth with Deep Watering Techniques
- Five Vegetables to Sow in May for New Gardeners
- How to Grow Courgettes: A Simple Step-by-Step
- Growing Swiss Chard: A Beginner’s Guide
- What to Sow in March
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