How long do the plants themselves actually live for, or perhaps you want to know how long the flowers last once your petunias bloom? To tackle the first part of the question, petunias can live for 2 or 3 years but generally behave as annuals because they can’t survive the freezing temperatures of the winter.Click to see full answer. People also ask, do petunias last all summer?Petunia Plant Profile. Petunias are one of the most popular garden flowers for both borders and containers. They are prolific bloomers, although some forms require deadheading to keep them going. However, most petunia varieties will bloom throughout the summer, except in extreme heat.Subsequently, question is, what is the lifespan of a petunia? How long do the plants themselves actually live for, or perhaps you want to know how long the flowers last once your petunias bloom? To tackle the first part of the question, petunias can live for 2 or 3 years but generally behave as annuals because they can’t survive the freezing temperatures of the winter. Simply so, do Petunias come back every year? Petunias are typically treated as annuals. Petunias, though, are actually perennials. In year-round warm climates, they survive and sometimes bloom throughout the winter. If you want your petunias to grow back in the spring, store them indoors during the winter.Do petunias need to be deadheaded?Deadheading petunias throughout the growing season tricks them into producing more flowers instead of seeds and keeps them looking neat. Leggy petunias may benefit from heavier pruning in the middle of the growing season. All parts of the flower should be removed, but some of the stem can remain.

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