Why your garden's weekly watering routine might be failing you
Relying on a fixed schedule like watering once a week can lead to waste or drought stress. To keep a garden thriving sustainably, you must move away from routines and learn to read the specific moisture needs of your soil and plants.
Effective gardening requires a shift from routine to observation. According to RHS horticultural advisor Adrian Thorne, the goal is to maintain a thriving garden while reducing overall water usage (S1:p1). Rather than following a set calendar, you should monitor for signs of stress, such as drooping leaves, which are often most visible in the early morning (S3:p2). For established trees, shrubs, and perennials in borders, watering should only be necessary during extreme periods of drought (S3:p2).
The depth of moisture is the most critical metric. When watering borders, aim to soak the ground slowly so that the soil remains damp at a depth of 15cm (6in) (S3:p2). For newly planted trees and shrubs, the requirement is more intensive; you should aim to moisten the soil to a depth of 20-30cm (8-12in) to reach the developing root zone (S3:p5). This care should continue for up to three summers for large specimens (S3:p5).
Different plant types demand distinct strategies. Containers and hanging baskets require daily checks from spring through autumn, specifically when the surface dries out 2-3cm (1in) below the top (S3:p3). Vegetables like lettuce and spinach thrive on consistent moisture, whereas root crops like carrots are more tolerant of less frequent watering (S3:p7). To prevent fungal diseases, always apply water to the base of the plant rather than the foliage (S3:p7). Finally, using mulch and adding organic matter are essential tactics to help the soil retain moisture and prevent evaporation (S1:p1, S3:p2, S3:p8).
Source: How to water your garden wisely | The RHS
