Determining if dahlias are annual or perennial flowers depends on where you live. Regions are divided into hardiness zones based on average annual temperatures throughout the year. Dahlias are classified as tender perennials. In hardiness zones eight through ten, they will return every year. Gardeners living in zone seven are borderline, but.. Dahlia plants are perennials, which means they can live for more than two years. However, their lifespan can vary depending on various factors such as the growing conditions, care, and the specific variety of dahlia. On average, a dahlia plant can live for about 3 to 5 years, but with the right care, it is possible to extend their lifespan even.

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In these regions, the dahlia is considered a tender perennial. To be on the safe side, you may want to overwinter your dahlias by digging up the tuberous roots. For dahlia gardeners in USDA regions 6 and lower, dahlias are annuals. Here, you must dig up the tuberous roots after the late summer bloom and store them over the winter.. Dahlias are tender perennials in their native warm climate of Mexico. In the U.S., they are considered perennials in hardiness zones 8 and higher. See the USDA hardiness zone page. However, in colder regions (zones 7 and lower), dahlias are treated as annuals. That said, some gardeners have had luck keeping the dahlias in the ground in zones 6.