What Vegetables to Sow in June – A Guide from Maxwells

June is one of the most rewarding months for sowing vegetables. The warmer soil and longer days give seeds the perfect conditions to germinate and grow quickly. Whether you’re working with a large garden or a few containers, there’s still plenty you can plant now for a productive season ahead.

Here at Maxwells DIY, we’ve highlighted some top vegetables you can sow next month, perfect for pairing with our full range of Unwins seeds in store.

Vegetables to Sow Outdoors in June

Carrots

Still time to sow maincrop carrots directly into well-prepared soil. Make sure the ground is free of stones, and water regularly to keep roots tender and straight.

Beetroot

Quick to germinate and easy to grow, beetroot thrives when sown in rows or clusters. Ideal for both roots and young leaves.

Beans (French & Runner)

With the risk of frost behind us, June is ideal for sowing beans straight into the ground. Give them some support to climb and keep the soil moist.

Courgettes and Marrows

These sun-loving vegetables do well when sown directly in June. They’ll need plenty of space and a regular drink—but reward you with a heavy crop.

Sweetcorn

For those with space, sweetcorn can still be sown in early June. Plant in blocks to help with pollination and enjoy fresh cobs later in summer.

Lettuce and Salad Leaves

Fast-growing salad crops are perfect for sowing little and often this month. Mix leaf types for variety and pick as needed for fresh, homegrown salads.

Radishes and Spring Onions

Quick wins for any garden, these can be tucked into borders or containers and are ready to harvest in just a few weeks.

Vegetables to Start Indoors or in a Seed Bed

Winter Brassicas

June is the time to get ahead for colder months by starting crops like kale, cabbage or sprouting varieties. Sow under cover or in a separate seed bed for transplanting later.

Leeks

If you haven’t already sown leeks, June offers a final chance. Start them in trays and transplant once they’re big enough to handle.

Top Tips from Maxwells DIY

• Water consistently: Especially during dry spells—young seedlings need steady moisture to thrive.
• Thin out where needed: Avoid overcrowding by thinning seedlings to give each plant the space it needs.
• Label your rows: It’s easy to forget what’s what—especially when everything starts growing!
• Keep pests at bay: Slugs and snails love tender new shoots. Try using barriers or organic deterrents to protect your crops.

Visit your local Maxwells DIY to browse our full range of Unwins vegetable seeds, compost, tools and everything else you need to get growing. Our team are always happy to help with friendly, practical advice.