July Growing Guide: What to Plant, Beat the Heat & Water Smarter | Hortiwool

July is the high point of the gardening calendar. The kitchen garden is in full swing, borders are bursting with colour, and after a soggy June (apart from the heatwave at the end), many of us are finally hoping for some proper summer sun. But with that warmth comes a new set of challenges and a fair bit of work to keep your garden looking its best.

Here's our complete July growing guide, covering what to plant now, how to manage the heat, smarter watering, and why a natural wool mulch could be the single most useful thing you add to your garden this month.

What to Grow in July

Even though it feels like the height of the season, July is far from too late to sow and plant. In fact, several crops actively prefer going in now.

Autumn salads and oriental leaves - Keep sowing lettuce, rocket, mizuna and other quick-growing leaves through July for a continuous harvest into autumn. Sow little and often, every couple of weeks, rather than all in one go.

Beetroot, radishes and spring onions - All three are fast, forgiving, and ideal for filling any gaps that open up as earlier crops are harvested.

Winter brassicas - July is prime time to plant out kale, winter cabbage and Brussels sprouts. They'll take their time over the coming months, rewarding you with a harvest well into winter. Net them as soon as they go in, cabbage white butterflies lay eggs from July onwards, and caterpillar damage can take hold within days.

Courgettes, French beans and tomatoes - These should be cropping well by now. Pick courgettes regularly while they're still young and tender. A plant left unpicked for a week will simply stop producing. With cordon tomatoes, keep pinching out sideshoots weekly to direct the plant's energy into the fruit rather than foliage.

Coping with the Heat

When the sun does properly arrive, your garden will feel it fast, particularly after a wetter-than-usual June. Here's how to help your plants cope.

Mulch before the heat sets in - This is one of the most valuable jobs you can do in early July. A good layer of mulch around the base of your plants insulates the soil, keeping roots cooler and significantly reducing how quickly moisture is lost to evaporation.

Provide shade where you can - Greenhouses heat up dramatically on sunny days, shading paint or netting on the glass makes a real difference to anything growing inside. In open beds, taller crops like sweetcorn or climbing beans can offer useful dappled shade to more delicate plants nearby.

Watch for wilting - A little wilting in the heat of the afternoon is completely normal — plants are simply protecting themselves from moisture loss. Wilting first thing in the morning, however, is a genuine sign of water stress and needs addressing straight away.

Net brassicas and protect soft fruit - Warm weather brings pests out in force. Fine mesh over brassicas and berries is far more effective than trying to pick pests off by hand once damage has started.

Watering: The Most Important July Job

Watering is, without question, the most time-consuming task in the July garden and it's also the job where poor technique wastes the most time and effort. A few simple principles make a big difference:

Water in the morning or evening - Watering in full sun means a large proportion evaporates before it ever reaches the roots.

Water deeply, not little and often - A thorough soak that reaches deep into the soil encourages strong root growth. Light, frequent watering just dampens the surface and trains roots to stay shallow.

Match the watering to the crop - Leafy veg like lettuce, spinach and herbs need consistent moisture to keep producing new growth. Fruiting crops such as tomatoes, courgettes and runner beans need less water until they flower, then benefit from deep watering every two to three days in dry spells. Root vegetables nearing harvest need comparatively little, just enough to avoid splitting.

Containers need daily attention - Pots and hanging baskets dry out fast in summer heat and get little benefit from passing showers. A thorough soak once a day, sometimes twice in a real heatwave, is usually necessary.

Keep water off the leaves - Water the soil surface rather than the foliage, particularly with tomatoes, damp leaves overnight are a leading cause of blight.

How Hortiwool Helps Through the Heat of Summer

This is where Hortiwool earns its place in the July garden. Our Garden Pad isn't just a passive layer on top of your soil, it's actively working in three ways at once.

It retains moisture.

Wool fibres can hold up to 30% of their weight in water, soaking up water and holding it close to plant roots rather than letting it evaporate straight off the soil surface. After watering or rainfall, a layer of Hortiwool keeps that moisture available for far longer, meaning less frequent watering and stronger, more resilient plants during dry spells.

It regulates soil temperature.

Just as wool insulates in clothing, it insulates in the ground. Hortiwool helps keep soil cooler during intense summer heat, protecting roots from temperature stress, while also buffering against cooler nights. It's a natural thermostat for your beds and borders.

It feeds your soil as it breaks down.

Unlike plastic mulch matting, wool is completely compostable. As it gradually decomposes over the season, it releases nitrogen and other nutrients directly into the soil, feeding your plants slowly and steadily, exactly when they need it most. It's mulching and feeding in a single, natural step.

Apply a layer around courgettes, beans, tomatoes and brassicas now, and you'll be doing your garden a genuine favour as the temperatures climb. It's also ideal around newly planted winter brassicas, helping them establish without drying out in the summer sun.

Your July Checklist

Sow autumn salads, rocket and oriental leaves every 2–3 weeks

Plant out winter brassicas and net immediately

Pick courgettes, beans and tomatoes regularly to keep plants productive

Pinch out tomato sideshoots weekly

Apply Hortiwool around thirsty crops before the heat peaks

Water deeply in the morning or evening

Check containers daily; soak thoroughly in hot weather

Net brassicas and soft fruit against pests

Provide shading for greenhouses on sunny days

Deadhead roses and bedding plants to keep displays going