We are increasingly conscious of the need to conserve water and the plants in your garden have been selected to suit the natural soil type and climate; in many cases drought tolerant species are favoured. However, until plants become established and their roots tap into soil water they are very susceptible to water stress (drought) and during this period adequate watering is essential. Establishing a good deep root system by careful watering in the short term will promote healthy, drought tolerant plants in the long term.
Areas of new turf are as vulnerable to drought as new plantings initially, but obviously establish more quickly. Sufficient watering in the early part of the season, if the weather is dry, will help to speed establishment.