Why Little and Often Fails Your Plants

When the sun beats down for days on end and the lawn starts to crackle underfoot, a quick daily sprinkle with the watering can feels like the right thing to do. It rarely is. Shallow watering only ever damps the top inch or two of soil, and that encourages roots to stay near the surface where they're at the mercy of every hot afternoon. The plants look fine for a week, then collapse the moment you miss a day.

Watering deeply and less often builds a far more resilient garden. A proper soak — enough to reach 15–20cm (6–8in) below the surface — draws roots downward into cooler, damper ground, and those deeper roots will carry a plant through a fortnight of drought. Aim for one thorough watering a week rather than a daily flick of the can, and two in the height of summer for hungry crops in free-draining soil.

One word of caution: on heavy clay, water can run off before it has a chance to sink in. Water in stages instead, giving the first canful ten minutes to disappear before adding the next. It sounds fussy, but it's the difference between a soak and a wasted afternoon.

Early Morning Beats Every Other Hour

Water at dawn if you possibly can. The soil is cool, evaporation is at its lowest, and any splashes on the foliage have the whole day to dry — which matters enormously for roses, courgettes and tomatoes prone to mildew and black spot.

Early evening is a reasonable second choice, but leaves that stay wet overnight are an open invitation to disease. Midday watering is the one to avoid: a startling amount is lost to the air before it ever reaches a root, and droplets sitting on leaves in full sun can scorch them.

If mornings are impossible in your household, water the soil rather than the plant and keep the spout low. A slow drink at the base always beats a shower from above.

Mulch: The Quiet Hero of a Dry Summer

If you do only one thing to prepare for a dry spell, make it mulching. A layer of well-rotted manure, garden compost, leafmould or bark chippings 5–8cm (2–3in) deep across your borders can cut moisture loss from the soil surface dramatically, and it keeps the ground several degrees cooler besides.

Always mulch onto already-damp soil — after watering or rain — otherwise you're simply trapping dryness in. Keep the material clear of stems, crowns and tree trunks to avoid rot setting in, and top it up through the season as it settles. Grass clippings, straw and even shredded paper will do the job on the vegetable patch at a push.

Getting Water Right to the Roots

Where the water lands matters as much as how much you use. A few tried-and-tested techniques:

• Sink a bottomless plastic bottle or old plant pot beside thirsty plants such as courgettes, tomatoes and dahlias, and pour water into it. It travels straight down to the roots instead of running off the surface.
• Water in a ring or shallow basin around the plant rather than against the stem, so the soil holds the water long enough to soak in.
• For containers, keep going until water runs from the drainage holes, then check again an hour later. A bone-dry rootball shrinks away from the sides of the pot, and water simply races down the gap.
• Use a fine rose on the can for seedlings and newly sown beds, so you don't wash seeds away or flatten tender stems.

Which Plants Deserve Your Attention

Not everything in the garden needs the same treatment, and rationing your effort pays dividends. Give priority to newly planted shrubs, trees and perennials in their first two years, whose roots haven't yet reached out into the wider soil. Containers, hanging baskets and anything under glass dry out far faster than open ground and will need checking daily in hot weather.

Then there are the hungry crops — runner beans, courgettes, tomatoes, cucumbers, salad leaves — which need steady moisture once they're flowering and fruiting. Moisture-lovers such as hydrangeas, hostas and ferns will be the first to flag, so keep an eye on them.

By contrast, established trees and shrubs, along with lavender, rosemary, thyme and most Mediterranean herbs, will ride out a dry spell with barely a complaint. Lawns will go brown and green up again after rain, so don't waste a drop on them.

Saving Every Drop

Hosepipe bans are a familiar feature of British summers, and they're no bad prompt to rethink how we use water. A water butt on every downpipe is the obvious starting point, and grey water from the bath or washing-up bowl can be tipped onto ornamental borders and mature shrubs — though not onto edibles you'll eat raw.

Group pots together so they shade one another, move containers into dappled shade during a heatwave, and check outdoor taps and hoses for leaks. Above all, before you reach for the can, push a finger into the soil. If it's damp 5cm down, walk away. It remains the most reliable moisture meter ever invented, and it costs nothing at all.