Thanks for writing. Newer-generation petunias, such as the Wave, Supertunia, or Potunia series typically don't need deadheading to stay in bloom, especially if you fertilize them regularly through the growing season.
If you have older varieties, though, it's helpful to pinch back the stems by about a fifth or quarter every month or so. Also be sure to keep fertilizing them --- petunias like a lot of nutrients to produce all those blooms!
---Justin, Senior Garden Editor, BHG.com
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