Growing in our home in January.

I've had this petunia since April 2017.
Knock on wood, she just keeps going and going and going after other petunias over the years have gone on to Petunia Heaven.

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Annual or Perennial?

"A true annual goes to seed after flowering and dies shortly after that in all climates. Petunias act like annuals in frosty areas, dying back with the first cold snap. As a mild climate perennial, however, petunias have the ability to grow year-round in the right climate. They like mild, frost-free winters and summers that rarely rise above 90 degrees Fahrenheit, with low humidity. Most areas don't provide these specific requirements, so petunias are most commonly grown as warm season annuals in frost-prone areas and as cool season annuals in tropical and subtropical areas."

In Spring, Summer, and Fall up until the first frost, this plant lives out on our deck. In Winter, it lives in our Solar Room if I can keep the temperature above 45 degrees. However, if Winter conditions outdoors become too bitterly cold (and then cause the space heaters in the Solar Room to NOT be able to hold the temperature up), I will bring her inside the main part of my home for a few days to avoid her freezing to death. However, experience has taught me that most petunias will not survive for very long over Winter in a low light indoors environment. They need light. That makes my growing mine in the cooler (but not freezing cold) Solar Room the best option. Having the Solar Room seems to be the secret to keep Petunias going in Winter.

Our Summers here get VERY hot and humid; which supposedly is not desirable for growing petunias. However, I've never lost a Petunia to the Summer heat. If temperatures remain in the 95 and above range for an extended period of time, they will sometimes slow down in flowering.

I've read that even if you can keep a petunia plant alive in a cold climate over Wintertime, the average petunia still has a limited lifespan of only 2 or 3 years. This Spring "Holy Cow" will be 6 years old. She's the only petunia to date that I've been able to keep going this long. I love this plant.