This depends on weather and how fast-draining your soil is. Sandy soil does not hold water well; therefore, it will need more frequent watering. Mulch slows water loss from the soil and helps keep roots from over-heating. Hot or windy weather dries plants out faster. The general rule is an inch of water each week from the time roses break dormancy through fall. If rainfall is adequate, there is no need for supplemental water with one caveat; if the rain is a sudden cloudburst, much of it runs off instead of soaking in. To improve sandy soil's water retention, add 2-3 inches of compost as a top-dressing annually.
Answered on February 2, 2018
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