This selection of frost hardy plants can survive winters down to US hardiness zone 2 or US hardiness zone 3. The following eight frost hardy perennials can flower year after year even in cold ...
Perennial plants being overwintered in pots are subjected to much harsher conditions compared to those in the soil. Because ...
Perennial in USDA zones 4 through 9 ... respectively, in USDA zones 3 through 7. Although most other types flower during summer, these late bloomers like to have the last word.