So the weather is good and your plants need water
Preferably when the sun is not directly on the trees & plants but do give them enough water, especially if you have them in pots or in ground that is built up or not great soil.
We can supply seep hose and even timers if it makes it easier but if you've gone to the trouble of buying beautiful trees, hedges & plants please please please water them
Some advice from the RHS on watering
Ideally water plants early in the morning, to avoid evaporation loss during the day. On warm summer days, evening watering is also likely to be effective, the dry soil soaking it in readily and low humidity at night reducing risk of disease.
To determine the need for watering, inspect the soil at a spade's depth. If the soil feels damp, there is unlikely to be any need to water, but if it is dry, then watering is probably required for some plants.
Be aware that clay soils can feel damp even when all available water has been used and that sand soils can feel dry even if some water is available. The only way around this is to develop experience in matching the observed state of an individual garden’s soil to the growth rate of the plants. Wilting is usually preceded by changes in leaf position and darkening of leaf colour.
For plants in pots, the compost looking paler or feeling dry to the touch and the pot becoming lighter in weight (and consequently more prone to blowing over) are all signs that the compost is beginning to dry and is in need of water.
It is better to water the garden before drought really sets in, to keep the soil moisture levels even and avoid soil moisture deficits building up.
Once drought has set in, it is futile to try and remedy this by light watering over a wide area. Light watering may encourage surface rather than deep roots, leaving plants more susceptible to drought. Instead, make a single thorough watering of the plants that are suffering. Try to water in the cool of the evening or the very early morning, so that less water is lost immediately to evaporation.