Dahlias are heat loving plants that grow best with lots of sun, 80 to 90 degree temperatures and nice warm soil. Unlike most annuals and perennials, they are at their best in late summer and they keep right on blooming right through the fall.
But as they say, all good things must come to an end, and by late October or early November, dahlias are finally wrapping it up. At this point, you can either treat them as annuals and plant a fresh batch of tubers next spring, or save the tubers from the varieties you really like and grow them again next year. Overwintering dahlias is easier than you might think. Read on for some easy, step-by-step instructions.