The best way to water most plants is by applying enough to moisten the plant’s entire root system, and then letting the soil dry out slightly before watering again.
The best time of day to water a garden is in the morning, since that gives the plants time to dry off before nightfall. Leaving water on plants overnight can lead to mold
Apply water slowly so it’s absorbed by the soil rather than running off — a soak er hose is ideal. Avoid daily light sprinklings, which encourage roots to grow near the soil surface where they’re vulnerable to drying out.
Rather than relying on a schedule, water plants when they need it. (Besides, how do you know when you’ve applied an inch of water with a soaker hose?
It’s usually best to apply water directly to the soil around plants rather than watering with a sprinkler. Less water is lost to evaporation, especially on hot, sunny days. Foliage stays dry, minimizing disease problems
drought-tolerant plants may need supplemental water only during extended dry spells. Note, however, that just because a plant is drought-tolerant doesn’t mean it doesn’t fare better with a regular supply of moisture.