Do Ageratum Come Back Every Year. In frost-free climates Sweet Alyssum can also be grown throughout the fall and winter. 26042021 Cover seeds lightly as seeds of ageratum plants need sunlight to germinate.
Get Started 215 660-3642. Sweet Alyssum is an annual plant although some varieties are hardy in frost-free areas. When left alone seeds from spent flowers will fall to the ground survive the winter up to -30 degrees and come back the next year as new plants.
11042021 In the northern limit of their range they behave as herbaceous perennials dying back to the root in cold winters.
But as I mentioned they do have a natural limit to their lives and will eventually die back for good after perhaps 3 years. Petunias though are actually perennials. Since they bloom on new wood even if there is no die- back cut them back to the ground every spring. Caring for ageratums includes regular watering until the plant is established.