Answer: A general rule of thumb for landscape shrubs and trees is to apply one inch of water per week, allowing it to slowly trickle down and thoroughly wet the root mass. This is best accomplished by building a basin around each plant to catch and hold water so it can penetrate the root area. Annuals and perennials will probably require water every 2-3 days in the heat you describe. Again, it's important to water slowly and deeply so the roots will be throughly soaked and will grow deep into the soil (and not be dependent on daily watering). Only experience will tell you how often you need to water - but plan on every 2-3 days during the hottest part of the season.
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