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Until they are established, they do need quite a bit more water than when they are firmly established, especially when planting in the heat.
Weather is critical. Along with rainfall and heat, keep in mind that wind dries out the soil very fast.
You also need to watch the intensity of the sun. As we get later into summer, the sun is brighter and more intense and will burn plants more easily. Small plants will dry up more quickly and wilt before you know it.
Watering also depends on your soil. Clay soil holds more water than loose or rocky soils. As you get to know your soil (and it can vary even in your own garden), stick a trowel or your finger into the ground to see how moist it is. You'll be amazed at the difference in just a few parts of your garden! For example, you may have heavier soil in one area but composted ones in another. Raised beds will dry out faster than ground ones.
Sunny areas dry out more quickly than shady ones, too.
But generally, you may have to water new plants every two to three days in hot weather. Fall and winter plants may not need water that often except when we have hot dry days then.
Be sure to mulch those new plants if you can, but be sure not to have mulch near the stems.
It's ideal to water in the morning, being careful to only water the soil and not the leaves. If your water is salty (alkaline, like ours), water on the leaves can burn the plants when the sun hits them.
In the fall, you can cut back on the watering. The first summer is when you want to be most attentive.
You also need to know your plant type, obviously. Perennials, which are not woody, will wilt faster and need more water. Woody plants will not need as much because they can store more in their stems. Be sure to give your plants a thorough soaking onto the ground. Don't just sprinkle some water. You want to let the water bubble up and soak in. Go to the next area and then come back and water the first one again.
Trees and shrubs will want deep slow watering and can be left for a week or more. Small annuals with roots near the surface may need more frequent attention. Extremely xeric plants will rot with too much water.
Ultimately, it comes down to weather conditions, soil type, and plant type. Watch your plants to see what's going on to respond to what each plant needs.