Answer: Based on the fact that it wilted even though it was watered but perked up after a rain, I'd recommend digging the plant, working the soil well, replanting, then watering it in to settle the soil. Rain definitely does a better job than any sprinkler does, so take your cue from the rain and apply water slowly so it can trickle down and wet the entire root mass. A deep soaking once a week should keep your forsythia happy. Best wishes with your forsythias!
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