Petunias are a summer garden staple, but this one glows in the dark. "It's really kind of freaky," said Vicki Rabas of ...

The firefly petunias were invented by Light Bio. A group of bioengineers spliced the petunia’s DNA with bioluminescent ...

Learning how to deadhead petunias is essential to keeping most varieties in full flower for as long as possible. Deadheading just means removing spent flowers. Don't worry—it's a snap.

An exception is calibrachoa, a relative of petunia that debuted in the 1990s and has taken the gardening public by storm. With flowers about an inch in diameter, callies look like miniature petunias.