Perennials: Would this plant be a perennial in Maryland ????, 1 by sempervirens

sempervirens wrote:
A trick I used was to place a flat rock over the verbena Homestead Purple in the winter and it did come back for 3 years for me. I'm in zone 6 but that area along the drive way is probably warmer. I redid that garden last year and lost track of it. This year a light blue verbena appeared growing between rocks and cement planters right on the asphalt. It must really like it hot. It's growing with volunteer kale and moss phlox subulata.