July Gardening Checklist: What to Plant, Prune, Water and Harvest This Month

How Do I Keep Flowers Blooming All Summer?

Deadheading is the single most effective July task for continuous flowering. Regularly deadhead roses, sweet peas, dahlias and bedding plants. Other flower-care jobs for July include:

1. Feeding sweet peas with a liquid feed to extend flowering
2. Disbudding dahlias (pinching out side buds) for fewer but larger blooms
3. Cutting back early-flowering perennials like delphiniums and lupins after their first flush — many will flower again later in summer

What Pruning Needs Doing in July?

• Wisteria - Summer-prune, shortening whippy shoots to 5–6 leaves
• Philadelphus, weigela - Trim once flowering has finished
• Hardy geraniums - Cut back after first flush for a second bloom
• Lavender - Trim after flowering to keep it compact
• Roses, sweet peas, dahlias, bedding - Deadhead regularly

How Often Should I Water in July?

Containers, hanging baskets and greenhouse plants need watering daily during hot spells, while new trees, shrubs and hedges are better off with a deep soak once a week rather than little and often. Tomatoes, peppers and courgettes should get a weekly high-potash feed alongside their watering, and if you haven't already, now's the time to apply a summer mulch to lock in soil moisture.

What Can I Harvest in July?

Courgettes, cucumbers and salad crops are best picked regularly, since harvesting encourages more to grow. Garlic and shallots are ready once their leaves turn yellow and topple over, soft fruit like strawberries, raspberries, currants and gooseberries are in full swing, and early potatoes can come up once their flowers open.

What Pests and Diseases Should I Watch for in July?

Warm, humid July weather is prime conditions for pests and disease. Check for:

• Blackfly on beans and aphids on roses — treat early before infestations spread
• Blight on tomatoes and potatoes — a particular risk in humid weather
• Cabbage white butterflies — net brassicas to protect them
• Slugs and snails — most active after rainfall

Lawn, Greenhouse and General Maintenance

On the lawn, raise your mower blades during dry spells to reduce stress on the grass, and keep hoeing borders regularly so weeds don't get a foothold while they're still small. Stake tall or floppy perennials like delphiniums and dahlias before they flop, and give climbing beans, tomatoes and cucumbers support as they grow. Top up bird baths and ponds in hot weather.

In the greenhouse, good ventilation and some shading will stop plants scorching, and damping down the floor on hot days raises humidity and helps deter red spider mite. It's also a good moment to repot or top-dress any permanent container plants whose roots have become congested.

July Gardening FAQ

Is July too late to sow flower seeds in the UK?

No. July is ideal for sowing biennials such as wallflowers and foxgloves (which flower next year), and there's still time for fast annuals like cornflowers, calendula, nasturtiums, nigella and cosmos to bloom before the first frosts.

What vegetables can I still plant in July?

Fast-maturing crops such as beetroot, carrots, radishes and salad leaves, plus leeks and brassicas for an autumn/winter harvest, and a final sowing of dwarf beans.

Why should I disbud dahlias?

Pinching out the side buds redirects the plant's energy into fewer flowers, producing larger, showier blooms — a common technique for exhibition and cut-flower dahlias.

How do I stop my tomatoes and potatoes getting blight in July?

Blight thrives in warm, humid conditions. Water at the base rather than over foliage, ensure good airflow between plants, and check leaves regularly so you can act at the first sign of brown or black patches.

Download our Free Printable Checklist

Want the whole list in one place to print and tick off? Grab the free PDF:

Download the UK July Gardening Checklist (PDF)

(Save it, print it, and keep it by the back door all month.)