Reading the Signs Before You Reach for the Hose

A proper British dry spell has a way of sneaking up on us. A fortnight of high pressure, a stiff easterly breeze and suddenly the lawn is straw-coloured and the runner beans are drooping by teatime. Before you drag the hose out, it is worth knowing what your plants are actually telling you.

Wilting in the middle of a hot afternoon is not always a cry for water. Many plants lose moisture faster than the roots can replace it during peak heat, then perk up again by evening. If foliage is still limp at seven in the morning, that is genuine drought stress. Get into the habit of pushing a finger two inches into the soil before watering. Damp at that depth means leave well alone; dry and crumbly means it is time.

Pay attention to soil type too. Sandy soils drain fast and need little and often, while clay holds on to moisture but can bake hard on the surface, so water runs off before it soaks in. A light fork-over before watering helps no end.

Water Early, Water Deeply

The single most useful change you can make is timing. Watering between 5am and 9am means the soil is cool, evaporation is minimal and foliage has dried by nightfall, which reduces the risk of mildew and botrytis. Evening watering is the next best option, though it does roll out the welcome mat for slugs and snails.

Midday watering is largely wasted — up to half can vanish before it reaches the roots — and droplets on leaves can act like tiny magnifying glasses in strong sun.

Depth matters more than frequency. A quick daily sprinkle encourages shallow, lazy roots that wilt at the first hint of drought. A thorough soak two or three times a week encourages roots to travel downwards. As a rough guide:

• Borders and veg beds: aim for 15–20 litres per square metre every three to four days in hot weather.
• Established shrubs and trees: a slow soak once a week is usually plenty.
• Newly planted trees: 10–15 litres twice a week for the first two summers.
• Tomatoes, courgettes and beans: steady moisture is essential — irregular watering brings split fruit and bitter cucumbers.

Direct the water at the soil, not the leaves, and let it trickle in slowly rather than blasting the surface into a crust.

Drip Irrigation: Steady Sips Rather Than a Flood

If you have a border, a greenhouse or a row of containers, drip irrigation is the most water-efficient upgrade you can make. A porous soaker hose or a drip line delivers water straight to the root zone, losing almost nothing to evaporation or wind. Paired with a simple battery timer, it will water your beds at dawn whether you are at work, on holiday or simply having a lie-in.

Run the line along the soil beneath your plants, pinning it down with pegs, and cover it with mulch so it disappears from view. A water butt feeding a low-pressure drip system is ideal, though you may need a small pump if gravity alone is sluggish. Always check your water supplier's current restrictions before setting anything up — during a hosepipe ban, hand watering from a can or a water butt is normally allowed, and drip irrigation is often exempt, but the rules vary from region to region.

Mulch: Your Soil's Summer Blanket

Mulching is the closest thing to a free lunch in gardening. A layer of organic matter over damp soil slows evaporation dramatically, keeps the root zone cooler and suppresses weeds that would otherwise compete for every drop.

Spread a 5–8cm layer of composted bark, leafmould, well-rotted manure or garden compost around established plants, tapering it away from stems and crowns so nothing rots. Water thoroughly first — mulching dry soil simply traps the dryness in. Grass clippings work well around hungry crops such as courgettes, but keep the layer thin or they will mat down and go sour. For containers, a topping of gravel or horticultural grit looks tidy and does the same job.

Keeping Containers Alive Through a Heatwave

Containers are the first casualties of any dry spell. Their compost volume is small, so they can dry out in a single hot day.

• Water in the morning and check again in the evening during a heatwave — twice a day is not excessive.
• Stand pots on saucers or trays so nothing drains away wasted, but empty them if rain is forecast.
• Group pots together in a shaded corner; they will shelter each other and lose less moisture.
• Move hanging baskets out of the fiercest midday sun if you can, and line them with a moisture-retaining liner.
• Feed weekly with a liquid tomato feed — stressed plants in small pots run out of nutrients fast.

Small Habits That Save a Lot of Water

Let the lawn go brown. It looks alarming, but established turf goes dormant and greens up within a fortnight of autumn rain. Save your water for the plants that cannot recover so easily: young trees, fruit bushes, containers and anything you planted this year.

Reuse what you already have — cooled cooking water from vegetables, the rinse from a salad spinner, even a bucket in the shower while it warms up. Keep a watering can by the back door so a sudden shower is captured rather than wasted. Water the thirstiest plants first, and don't fuss over the rest. A garden that has to work a little for its water grows tougher roots, and it will come through the next dry spell far better than one that was mollycoddled.