Answer: Since you've only just planted your leggy petunias, give them several days to become established, then start pinching them back to make compact plants. Don't just cut all the stems back at once - they will need some of their leaves to help them grow. But it you pinch back every third stem now, then wait for new growth from the pinched stems, then pinch back a few more of the leggy stems, you've eventually have lush, full plants. Enjoy!
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